XML 45 R10.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Summary of Significant Accounting and Reporting Policies | 12 Months Ended
--- | ---
Dec. 31, 2017
Accounting Policies [Abstract] |
Summary of Significant Accounting and Reporting Policies | Summary of Significant Accounting and Reporting Policies Basis of Presentation - The operations of NextEra Energy, Inc. (NEE) are conducted primarily through Florida Power & Light Company (FPL), a wholly owned subsidiary, and NextEra Energy Resources, LLC (NEER), a wholly owned indirect subsidiary. FPL, a rate-regulated electric utility, supplies electric service to nearly five million customer accounts throughout most of the east and lower west coasts of Florida. NEER invests in independent power projects through both controlled and consolidated entities and noncontrolling ownership interests in joint ventures essentially all of which are accounted for under the equity method. NEER also participates in natural gas, natural gas liquids and oil production primarily through non-operating ownership interests and in pipeline infrastructure through either wholly owned subsidiaries or noncontrolling or joint venture interests. The consolidated financial statements of NEE and FPL include the accounts of their respective majority-owned and controlled subsidiaries. Intercompany balances and transactions have been eliminated in consolidation. Certain amounts included in prior years' consolidated financial statements have been reclassified to conform to the current year's presentation. The preparation of financial statements requires the use of estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent assets and liabilities. Actual results could differ from those estimates. NextEra Energy Partners, LP - NextEra Energy Partners, LP (NEP) was formed in 2014. NEP acquires, manages and owns contracted clean energy projects with stable, long-term cash flows through a limited partner interest in NextEra Energy Operating Partners, LP (NEP OpCo). At December 31, 2017, NEE owned a controlling general partner interest in NEP and consolidated NEP for financial reporting purposes (see below for discussion of deconsolidation of NEP). NEE presented its limited partner interests in NEP as a noncontrolling interest in NEE's consolidated financial statements. Certain equity and asset transactions between NEP, NEER and NEP OpCo involve the exchange of cash, energy projects and ownership interests in NEP OpCo. These exchanges were accounted for under the profit sharing method and resulted in a profit sharing liability, net of amortization, of approximately $866 million and $757 million at December 31, 2017 and 2016, respectively, which is reflected in noncurrent other liabilities on NEE's consolidated balance sheets. In 2016 and 2017, a portion of the profit sharing liability was amortized into income on a straight-line basis over the estimated useful lives of the underlying energy projects held by NEP OpCo. Accordingly, the profit sharing liability amortization totaled approximately $28 million and $37 million during 2017 and 2016 and is included in taxes other than income taxes and other - net in NEE’s consolidated statements of income (see Accounting for Partial Sales of Nonfinancial Assets below). Upon completion of NEP's initial public offering (IPO) in July 2014, NEE, through an indirect wholly owned subsidiary had a 79.9% interest in NEP's operating projects. Since the IPO, NEP has sold 35,527,435 common units and purchased 35,527,435 NEP OpCo common units. Also, in 2015, a subsidiary of NEE purchased 27,000,000 of NEP OpCo's common units. After giving effect to these transactions, NEE’s partnership interest in NEP OpCo's operating projects based on the number of outstanding NEP OpCo common units is approximately 65.1% at December 31, 2017. At December 31, 2017, NEP, through NEER's contribution of energy projects to NEP OpCo, owns or has an interest in a portfolio of 26 wind and solar projects with generating capacity totaling approximately 3,728 megawatts (MW), as well as a portfolio of seven long-term contracted natural gas pipeline assets located in Texas. In October 2015, NEE authorized a program to purchase, from time to time, up to $150 million of common units representing limited partner interests in NEP. Under the program, purchases may be made in amounts, at prices and at such times as NEE or its subsidiaries deem appropriate, all subject to market conditions and other considerations. The common unit purchase program does not require NEE to acquire any specific number of common units and may be modified or terminated by NEE at any time. The purchases may be made in the open market or in privately negotiated transactions. As of December 31, 2017, NEE had purchased approximately $36 million of NEP common units under this program. During the third quarter of 2017, changes to NEP's governance structure were made that, among other things, enhanced NEP unitholder governance rights. The new governance structure established a NEP board of directors whereby NEP unitholders have the ability to nominate and elect board members, subject to certain limitations and requirements. As a result of these governance changes, NEP was deconsolidated from NEE in January 2018, which is when the term of office of the first NEP unitholder-elected directors took effect. As a result of the deconsolidation of NEP, NEE will reflect its ownership interest in NEP as an equity method investment and future earnings from NEP as equity in earnings of equity method investees in its consolidated financial statements. Upon deconsolidation, the equity method investment was recorded at fair value which resulted in a gain of approximately $4 billion ($3 billion after tax) and will be recorded in NEE's condensed consolidated statements of income during the three months ended March 31, 2018. Additionally, sales of assets to NEP after deconsolidation will be accounted for as third-party sales. Rate Regulation - FPL is subject to rate regulation by the Florida Public Service Commission (FPSC) and the Federal Energy Regulatory Commission (FERC). Its rates are designed to recover the cost of providing electric service to its customers including a reasonable rate of return on invested capital. As a result of this cost-based regulation, FPL follows the accounting guidance that allows regulators to create assets and impose liabilities that would not be recorded by non-rate regulated entities. Regulatory assets and liabilities represent probable future revenues that will be recovered from or refunded to customers through the ratemaking process. NEE's and FPL's regulatory assets and liabilities are as follows:
| NEE |  | FPL
| December 31, |  | December 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
| (millions)
Regulatory assets: |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Storm reserve deficiency | $ | — |  |  | $ | 203 |  |  | $ | — |  |  | $ | 203 |
Other | 336 |  |  | 321 |  |  | 335 |  |  | 321 |
Total | $ | 336 |  |  | $ | 524 |  |  | $ | 335 |  |  | $ | 524 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |
Acquisition of purchased power agreements | $ | 963 |  |  | $ | 636 |  |  | $ | 963 |  |  | $ | 636 |
Other | 1,506 |  |  | 1,258 |  |  | 1,286 |  |  | 937 |
Total | $ | 2,469 |  |  | $ | 1,894 |  |  | $ | 2,249 |  |  | $ | 1,573 |
Regulatory liabilities: |  |  |  |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |
Derivatives | $ | — |  |  | $ | 208 |  |  | $ | — |  |  | $ | 208 |
Deferred clause revenues | 296 |  |  | 86 |  |  | 296 |  |  | 86 |
Other | 50 |  |  | 5 |  |  | 37 |  |  | — |
Total | $ | 346 |  |  | $ | 299 |  |  | $ | 333 |  |  | $ | 294 |
Noncurrent: |  |  |  |  |  |  |  |  |  |  |
Accrued asset removal costs | $ | 601 |  |  | $ | 1,956 |  |  | $ | 585 |  |  | $ | 1,944 |
Asset retirement obligation regulatory expense difference | 2,569 |  |  | 2,294 |  |  | 2,569 |  |  | 2,294 |
Deferred taxes | 4,981 |  |  | 96 |  |  | 4,903 |  |  | 96 |
Other | 614 |  |  | 560 |  |  | 585 |  |  | 559 |
Total | $ | 8,765 |  |  | $ | 4,906 |  |  | $ | 8,642 |  |  | $ | 4,893 |
Cost recovery clauses, which are designed to permit full recovery of certain costs and provide a return on certain assets allowed to be recovered through various clauses, include substantially all fuel, purchased power and interchange expense, certain costs associated with the acquisition of certain generation facilities, certain construction-related costs for certain of FPL's solar generation facilities, and conservation and certain environmental-related costs. Revenues from cost recovery clauses are recorded when billed; FPL achieves matching of costs and related revenues by deferring the net underrecovery or overrecovery. Any underrecovered costs or overrecovered revenues are collected from or returned to customers in subsequent periods. In 2015, FPL assumed ownership of a 250 MW coal-fired generation facility located in Jacksonville, Florida (Cedar Bay generation facility) and terminated its long-term purchased power agreement for substantially all of the facility’s capacity and energy for a purchase price of approximately $521 million. The FPSC approved a stipulation and settlement between the State of Florida Office of Public Counsel (OPC) and FPL regarding issues relating to the ratemaking treatment for the Cedar Bay generation facility which provides for recovery of the purchase price and associated income tax gross-up as a regulatory asset of approximately $847 million which will be amortized over approximately nine years. At December 31, 2017 and 2016, the regulatory assets, net of amortization, totaled approximately $636 million and $726 million, respectively, and are included in current and noncurrent regulatory assets on NEE’s and FPL’s consolidated balance sheets. This settlement also reduced the reserve amount that was available for amortization under the 2012 rate agreement by $30 million to $370 million. See Revenues and Rates - FPL Rates Effective January 2013 through December 2016 below. In December 2016, FPL retired the Cedar Bay generation facility. In 2017, FPL assumed ownership of a 330 MW coal-fired generation facility located in Indiantown, Florida (Indiantown generation facility) for a purchase price of $451 million (including existing debt of approximately $218 million). FPL recorded a regulatory asset for approximately $451 million, which is being amortized over nine years. Prior to assuming ownership of this facility, FPL had a long-term purchased power agreement with this facility for substantially all of its capacity and energy. FPL expects to reduce the plant's operations with the intention of phasing the plant out of service. At December 31, 2017, the regulatory asset, net of amortization totaled approximately $401 million and is included in current and noncurrent regulatory assets on NEE's and FPL's consolidated balance sheets. If FPL were no longer subject to cost-based rate regulation, the existing regulatory assets and liabilities would be written off unless regulators specify an alternative means of recovery or refund. In addition, the FPSC has the authority to disallow recovery of costs that it considers excessive or imprudently incurred. The continued applicability of regulatory accounting is assessed at each reporting period. Revenues and Rates - FPL's retail and wholesale utility rate schedules are approved by the FPSC and the FERC, respectively. FPL records unbilled revenues for the estimated amount of energy delivered to customers but not yet billed. FPL's unbilled revenues are included in customer receivables on NEE's and FPL's consolidated balance sheets and amounted to approximately $423 million and $261 million at December 31, 2017 and 2016, respectively. FPL's operating revenues also include amounts resulting from cost recovery clauses (see Rate Regulation above), franchise fees, gross receipts taxes and surcharges related to storms (see Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve below). Franchise fees and gross receipts taxes are imposed on FPL; however, the FPSC allows FPL to include in the amounts charged to customers the amount of the gross receipts tax for all customers and the franchise fee for those customers located in the jurisdiction that imposes the amount. Accordingly, franchise fees and gross receipts taxes are reported gross in operating revenues and taxes other than income taxes and other in NEE's and FPL's consolidated statements of income and were approximately $767 million, $700 million and $722 million in 2017, 2016 and 2015, respectively. The revenues from the surcharges related to storms included in operating revenues in NEE's and FPL's consolidated statements of income were approximately $393 million, $119 million and $115 million in 2017, 2016 and 2015, respectively. FPL also collects municipal utility taxes which are reported gross in customer receivables and accounts payable on NEE's and FPL's consolidated balance sheets. FPL Rates Effective January 2017 through December 2020 - In December 2016, the FPSC issued a final order approving a stipulation and settlement between FPL and several intervenors in FPL's base rate proceeding (2016 rate agreement). Key elements of the 2016 rate agreement, which is effective from January 2017 through at least December 2020, include, among other things, the following:
• | New retail base rates and charges were established resulting in the following increases in annualized retail base revenues:
◦ | $400 million beginning January 1, 2017;
◦ | $211 million beginning January 1, 2018; and
◦ | $200 million when a new approximately 1,750 MW natural gas-fired combined-cycle unit in Okeechobee County, Florida achieves commercial operation, which is expected to occur in mid-2019.
• | In addition, FPL is eligible to receive, subject to conditions specified in the 2016 rate agreement, base rate increases associated with the addition of up to 300 MW annually of new solar generation in each of 2017 through 2020 and may carry forward any unused MW to subsequent years during the term of the 2016 rate agreement. Approximately 300 MW of new solar generating capacity became operational in January 2018. An additional 300 MW is expected to be operational by March 2018 and in both 2019 and 2020. FPL will be required to demonstrate that any proposed solar facilities are cost effective and scheduled to be in service before December 31, 2021. FPL has agreed to an installed cost cap of $1,750 per kilowatt (kW).
• | FPL's allowed regulatory return on common equity (ROE) is 10.55%, with a range of 9.60% to 11.60%. If FPL's earned regulatory ROE falls below 9.60%, FPL may seek retail base rate relief. If the earned regulatory ROE rises above 11.60%, any party other than FPL may seek a review of FPL's retail base rates.
• | Subject to certain conditions, FPL may amortize, over the term of the 2016 rate agreement, up to $1.0 billion of depreciation reserve surplus plus the reserve amount remaining under FPL's 2012 rate agreement discussed below (approximately $250 million), provided that in any year of the 2016 rate agreement, FPL must amortize at least enough reserve to maintain a 9.60% earned regulatory ROE but may not amortize any reserve that would result in an earned regulatory ROE in excess of 11.60%. See Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve below for discussion of the reserve amortization impact following the enactment of the Tax Cuts and Jobs Act (tax reform).
• | Future storm restoration costs would be recoverable on an interim basis beginning 60 days from the filing of a cost recovery petition, but capped at an amount that could produce a surcharge of no more than $4 for every 1,000 kilowatt-hour (kWh) of usage on residential bills during the first 12 months of cost recovery. Any additional costs would be eligible for recovery in subsequent years. If storm restoration costs exceed $800 million in any given calendar year, FPL may request an increase to the $4 surcharge to recover amounts above $400 million. See Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve below.
In January 2017, the Sierra Club filed a notice of appeal challenging the FPSC’s final order approving the 2016 rate agreement, which notice of appeal is pending before the Florida Supreme Court. FPL Rates Effective January 2013 through December 2016 - Effective January 2013, pursuant to an FPSC final order approving a stipulation and settlement between FPL and several intervenors in FPL's base rate proceeding (2012 rate agreement), new retail base rates and charges for FPL were established resulting in an increase in retail base revenues of $350 million on an annualized basis. The 2012 rate agreement, provided for, among other things, the following:
• | a regulatory ROE of 10.50% with a range of plus or minus 100 basis points;
• | an increase in annualized base revenue requirements as each of three FPL modernized power plants became operational in April 2013, April 2014 and April 2016;
• | the continuation of cost recovery through the capacity cost recovery clause (capacity clause) (reported as retail base revenues) for a generating unit which was placed in service in May 2011 (beginning January 2017, under the 2016 rate agreement, cost recovery is through base rates);
• | subject to certain conditions, the right to reduce depreciation expense up to $400 million (reserve), provided that in any year of the 2012 rate agreement, FPL was required to amortize enough reserve to maintain an earned regulatory ROE within the range of 9.50% to 11.50% (see Rate Regulation above regarding a subsequent reduction in the reserve amount);
• | an interim cost recovery mechanism for storm restoration costs (see Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve below); and
• | an incentive mechanism whereby customers receive 100% of certain gains, including but not limited to, gains from the purchase and sale of electricity and natural gas (including transportation and storage), up to a specified threshold; gains exceeding that specified threshold were shared by FPL and its customers.
NEER's revenue is recorded on the basis of commodities delivered, contracts settled or services rendered and includes estimated amounts yet to be billed to customers. Certain commodity contracts for the purchase and sale of power that meet the definition of a derivative are recorded at fair value with subsequent changes in fair value recognized as revenue. See Energy Trading below and Note 3. Effective January 1, 2018, NEE and FPL adopted an accounting standards update that provides guidance on the recognition of revenue from contracts with customers and requires additional disclosures regarding such contracts (new revenue standard). NEE and FPL adopted the new revenue standard using the modified retrospective approach with the cumulative effect recognized as an adjustment to retained earnings on January 1, 2018. FPL and NEER generate substantially all of NEE’s operating revenues. FPL’s revenue from contracts with customers is derived primarily from tariff-based sales that result from providing electricity to retail customers in Florida with no defined contractual term. For these types of sales, FPL will recognize revenues under the new revenue standard as electricity is delivered and billed to customers, as well as an estimate for electricity delivered and not yet billed. NEER’s revenue from contracts with customers is derived primarily from the sale of energy commodities, electric capacity and electric transmission. For these types of sales, NEER will recognize revenues under the new revenue standard as energy commodities are delivered and as electric capacity and electric transmission are made available, consistent with the amounts billed to customers. NEER believes for substantially all of its contracts with customers that the obligation to deliver energy, capacity or transmission is satisfied over time as the customer simultaneously receives and consumes benefits as NEER performs. Revenue recognition under the new revenue standard for both FPL and NEER is substantially consistent with prior practice and as a result the cumulative effect of adopting the new revenue standard on January 1, 2018 was not material to NEE or FPL. Electric Plant, Depreciation and Amortization - The cost of additions to units of property of FPL and NEER is added to electric plant in service and other property. In accordance with regulatory accounting, the cost of FPL's units of utility property retired, less estimated net salvage value, is charged to accumulated depreciation. Maintenance and repairs of property as well as replacements and renewals of items determined to be less than units of utility property are charged to other operations and maintenance (O&M) expenses. At December 31, 2017, the electric generation, transmission, distribution and general facilities of FPL represented approximately 49%, 11%, 34% and 6%, respectively, of FPL's gross investment in electric utility plant in service and other property. Substantially all of FPL's properties are subject to the lien of FPL's mortgage, which secures most debt securities issued by FPL. A number of NEER's generation and pipeline facilities are encumbered by liens securing various financings. The net book value of NEER's assets serving as collateral was approximately $15.6 billion at December 31, 2017. The American Recovery and Reinvestment Act of 2009, as amended (Recovery Act), provided for an option to elect a cash grant (convertible investment tax credits (ITCs)) for certain renewable energy property (renewable property). Convertible ITCs are recorded as a reduction in property, plant and equipment on NEE's and FPL's consolidated balance sheets and are amortized as a reduction to depreciation and amortization expense over the estimated life of the related property. At December 31, 2017 and 2016, convertible ITCs, net of amortization, were approximately $1.9 billion ($140 million at FPL) and $2.1 billion ($147 million at FPL). At December 31, 2017 and 2016, approximately $138 million and $289 million, respectively, of such convertible ITCs are included primarily in other receivables on NEE's consolidated balance sheets. Depreciation of FPL's electric property is primarily provided on a straight-line average remaining life basis. FPL includes in depreciation expense a provision for fossil and solar plant dismantlement, interim asset removal costs, accretion related to asset retirement obligations (see Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs below), storm recovery amortization and amortization of pre-construction costs associated with planned nuclear units recovered through a cost recovery clause. For substantially all of FPL's property, depreciation studies are typically performed and filed with the FPSC every four years. In accordance with the 2012 rate agreement, FPL was not required to file depreciation studies during the effective period of the agreement; therefore, previously approved depreciation rates which became effective January 1, 2010 remained in effect through December 2016. As part of the 2016 rate agreement, the FPSC approved new depreciation rates which became effective January 1, 2017. As discussed in Revenues and Rates above, the use of reserve amortization is permitted under the 2016 rate agreement and was also permitted under the 2012 rate agreement. In accordance with the 2016 rate agreement and the 2012 rate agreement, FPL recorded reserve amortization (reversal) of approximately $1,250 million, $13 million and $(15) million in 2017, 2016 and 2015, respectively. Reserve amortization is recorded as a reduction to (or when reversed as an increase to) accrued asset removal costs which is reflected in noncurrent regulatory liabilities on NEE's and FPL's consolidated balance sheets. In December 2017, following the enactment of tax reform, FPL used available reserve amortization to offset nearly all of the write-off of Hurricane Irma storm restoration costs, and FPL plans to partially restore the reserve amortization through tax savings generated during the term of the 2016 rate agreement. See Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve below and Note 5. The weighted annual composite depreciation and amortization rate for FPL's electric utility plant in service, including capitalized software, but excluding the effects of decommissioning, dismantlement and the depreciation adjustments discussed above, was approximately 3.7%, 3.4% and 3.3% for 2017, 2016 and 2015, respectively. FPL files a twelve-month forecast with the FPSC each year which contains a regulatory ROE intended to be earned based on the best information FPL has at that time assuming normal weather. This forecast establishes a fixed targeted regulatory ROE. In order to earn the targeted regulatory ROE in each reporting period under the effective rate agreement, reserve amortization is calculated using a trailing thirteen-month average of retail rate base and capital structure in conjunction with the trailing twelve months regulatory retail base net operating income, which primarily includes the retail base portion of base and other revenues, net of O&M, depreciation and amortization, interest and tax expenses. In general, the net impact of these income statement line items is adjusted, in part, by reserve amortization or its reversal to earn the targeted regulatory ROE. NEER's electric plant in service less salvage value, if any, are depreciated primarily using the straight-line method over their estimated useful lives. At December 31, 2017 and 2016, wind, solar and nuclear plants represented approximately 61% and 62%, 15% and 14% and 9% and 10%, respectively, of NEER's depreciable electric plant in service and other property. The estimated useful lives of NEER's plants range primarily from 25 to 35 years for wind plants, 25 to 30 years for solar plants and from 20 to 47 years for nuclear plants. NEER reviews the estimated useful lives of its fixed assets on an ongoing basis. In 2017, this review indicated that the actual lives of certain equipment at its wind plants are expected to be longer than those previously estimated for depreciation purposes. As a result, effective January 1, 2017, NEER changed the estimated useful lives of certain wind plant equipment from 30 years to 35 years to better reflect the period during which these assets are expected to remain in service. This change increased net income attributable to NEE by approximately $60 million and basic and diluted earnings per share attributable to NEE by approximately $0.12 for the year ended December 31, 2017. NEER's oil and gas production assets, representing approximately 9% and 8%, respectively, of NEER's depreciable electric plant in service and other property at December 31, 2017 and 2016, are accounted for under the successful efforts method. Depletion expenses for the acquisition of reserve rights and development costs are recognized using the unit of production method. Nuclear Fuel - FPL and NEER have several contracts for the supply of uranium and the conversion, enrichment and fabrication of nuclear fuel. See Note 13 - Contracts. FPL's and NEER's nuclear fuel costs are charged to fuel expense on a unit of production method. Construction Activity - Allowance for funds used during construction (AFUDC) is a noncash item which represents the allowed cost of capital, including an ROE, used to finance construction projects. The portion of AFUDC attributable to borrowed funds is recorded as a reduction of interest expense and the remainder is recorded as other income. For FPL, FPSC rules limit the recording of AFUDC to projects that have an estimated cost in excess of 0.5% of a utility's plant in service balance and require more than one year to complete. FPSC rules allow construction projects below the 0.5% threshold as a component of rate base. During 2017, 2016 and 2015, FPL capitalized AFUDC at a rate of 6.16%, 6.34% and 6.34%, respectively, which amounted to approximately $101 million, $97 million and $88 million, respectively. See Note 13 - Commitments. FPL's construction work in progress includes construction materials, progress payments on major equipment contracts, engineering costs, AFUDC and other costs directly associated with the construction of various projects. Upon completion of the projects, these costs are transferred to electric utility plant in service and other property. Capitalized costs associated with construction activities are charged to O&M expenses when recoverability is no longer probable. NEER capitalizes project development costs once it is probable that such costs will be realized through the ultimate construction of a power plant or sale of development rights. At December 31, 2017 and 2016, NEER's capitalized development costs totaled approximately $433 million and $193 million, respectively, which are included in noncurrent other assets on NEE's consolidated balance sheets. These costs include land rights and other third-party costs directly associated with the development of a new project. Upon commencement of construction, these costs either are transferred to construction work in progress or remain in other assets, depending upon the nature of the cost. Capitalized development costs are charged to O&M expenses when it is no longer probable that these costs will be realized. NEER's construction work in progress includes construction materials, progress payments on major equipment contracts, third-party engineering costs, capitalized interest and other costs directly associated with the construction and development of various projects. Interest capitalized on construction projects amounted to approximately $89 million, $107 million and $100 million during 2017, 2016 and 2015, respectively. Interest expense allocated from NextEra Energy Capital Holdings, Inc. (NEECH) to NEER is based on a deemed capital structure of 70% debt. Upon commencement of plant operation, costs associated with construction work in progress are transferred to electric plant in service and other property. Asset Retirement Obligations - NEE and FPL each account for asset retirement obligations and conditional asset retirement obligations (collectively, AROs) under accounting guidance that requires a liability for the fair value of an ARO to be recognized in the period in which it is incurred if it can be reasonably estimated, with the offsetting associated asset retirement costs capitalized as part of the carrying amount of the long-lived assets. The asset retirement cost is subsequently allocated to expense, for NEE's non-rate regulated operations, and regulatory liability, for FPL, using a systematic and rational method over the asset’s estimated useful life. Changes in the ARO resulting from the passage of time are recognized as an increase in the carrying amount of the liability and as accretion expense, which is included in depreciation and amortization expense in the consolidated statements of income for NEE's non-rate regulated operations, and ARO and regulatory liability, in the case of FPL. Changes resulting from revisions to the timing or amount of the original estimate of cash flows are recognized as an increase or a decrease in the asset retirement cost, or income when asset retirement cost is depleted, in the case of NEE's non-rate regulated operations, and ARO and regulatory liability, in the case of FPL. See Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs below and Note 12. Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs - For ratemaking purposes, FPL accrues for the cost of end of life retirement and disposal of its nuclear, fossil and solar plants over the expected service life of each unit based on nuclear decommissioning and fossil and solar dismantlement studies periodically filed with the FPSC. In addition, FPL accrues for interim removal costs over the life of the related assets based on depreciation studies approved by the FPSC. As approved by the FPSC, FPL previously suspended its annual decommissioning accrual. For financial reporting purposes, FPL recognizes decommissioning and dismantlement liabilities in accordance with accounting guidance that requires a liability for the fair value of an ARO to be recognized in the period in which it is incurred. Any differences between expense recognized for financial reporting purposes and the amount recovered through rates are reported as a regulatory liability in accordance with regulatory accounting. See Revenues and Rates, Electric Plant, Depreciation and Amortization, Asset Retirement Obligations above and Note 12. Nuclear decommissioning studies are performed at least every five years and are submitted to the FPSC for approval. FPL filed updated nuclear decommissioning studies with the FPSC in December 2015. These studies reflect FPL's current plans, under the operating licenses, for prompt dismantlement of Turkey Point Units Nos. 3 and 4 following the end of plant operation with decommissioning activities commencing in 2032 and 2033, respectively, and provide for St. Lucie Unit No. 1 to be mothballed beginning in 2036 with decommissioning activities to be integrated with the prompt dismantlement of St. Lucie Unit No. 2 in 2043. These studies also assume that FPL will be storing spent fuel on site pending removal to a United States (U.S.) government facility. The studies indicate FPL's portion of the ultimate costs of decommissioning its four nuclear units, including costs associated with spent fuel storage above what is expected to be refunded by the U.S. Department of Energy (DOE) under a spent fuel settlement agreement, to be approximately $7.5 billion, or $3.1 billion expressed in 2017 dollars. Restricted funds for the payment of future expenditures to decommission FPL's nuclear units are included in nuclear decommissioning reserve funds, which are included in special use funds on NEE's and FPL's consolidated balance sheets. Marketable securities held in the decommissioning funds are primarily classified as available for sale and carried at fair value. See Note 4. Fund earnings, consisting of dividends, interest and realized gains and losses, net of taxes, are reinvested in the funds. Fund earnings, as well as any changes in unrealized gains and losses, are not recognized in income and are reflected as a corresponding offset in the related regulatory liability accounts. FPL does not currently make contributions to the decommissioning funds, other than the reinvestment of fund earnings. During 2017, 2016 and 2015 fund earnings on decommissioning funds were approximately $114 million, $102 million and $96 million, respectively. The tax effects of amounts not yet recognized for tax purposes are included in deferred income taxes. Fossil and solar plant dismantlement studies are typically performed at least every four years and are submitted to the FPSC for approval. In accordance with the 2012 rate agreement, FPL was not required to file fossil and solar dismantlement studies during the effective period of the agreement; therefore, previously approved studies which became effective January 1, 2010 remained in effect through December 2016 and resulted in an annual expense of $18 million which is recorded in depreciation and amortization expense in NEE's and FPL's consolidated statements of income. As part of the 2016 rate agreement, the FPSC approved a new annual expense of $26 million based on FPL's 2016 fossil and solar dismantlement studies which became effective January 1, 2017. At December 31, 2017, FPL's portion of the ultimate cost to dismantle its fossil and solar units is approximately $1.2 billion, or $497 million expressed in 2017 dollars. NEER records nuclear decommissioning liabilities for Seabrook Station (Seabrook), Duane Arnold Energy Center (Duane Arnold) and Point Beach Nuclear Power Plant (Point Beach) and dismantlement liabilities for its wind and solar facilities, when required in accordance with accounting guidance that requires a liability for the fair value of an ARO to be recognized in the period in which it is incurred. The liabilities are being accreted using the interest method through the date decommissioning or dismantlement activities are expected to be complete. See Note 12. At December 31, 2017 and 2016, NEER's ARO, which is primarily related to nuclear decommissioning and wind and solar dismantlement, was approximately $984 million and $817 million, respectively, and was primarily determined using various internal and external data and applying a probability percentage to a variety of scenarios regarding the life of the plant and timing of decommissioning or dismantlement. NEER's portion of the ultimate cost of decommissioning its nuclear plants, including costs associated with spent fuel storage above what is expected to be refunded by the DOE under a spent fuel settlement agreement, is estimated to be approximately $10.8 billion, or $2.0 billion expressed in 2017 dollars. The ultimate cost to dismantle NEER's wind and solar facilities is estimated to be approximately $1.9 billion. Seabrook files a comprehensive nuclear decommissioning study with the New Hampshire Nuclear Decommissioning Financing Committee (NDFC) every four years; the most recent study was filed in 2015. Seabrook's decommissioning funding plan is also subject to annual review by the NDFC. Currently, there are no ongoing decommissioning funding requirements for Seabrook, Duane Arnold and Point Beach, however, the U.S. Nuclear Regulatory Commission (NRC), and in the case of Seabrook, the NDFC, has the authority to require additional funding in the future. NEER's portion of Seabrook's, Duane Arnold's and Point Beach's restricted funds for the payment of future expenditures to decommission these plants is included in nuclear decommissioning reserve funds, which are included in special use funds on NEE's consolidated balance sheets. Marketable securities held in the decommissioning funds are primarily classified as available for sale and carried at fair value. Market adjustments result in a corresponding adjustment to other comprehensive income (OCI), except for unrealized losses associated with marketable securities considered to be other than temporary, including any credit losses, which are recognized as other than temporary impairment losses on securities held in nuclear decommissioning funds in NEE's consolidated statements of income. Fund earnings are recognized in income and are reinvested in the funds. See Note 4. The tax effects of amounts not yet recognized for tax purposes are included in deferred income taxes. Major Maintenance Costs - FPL expenses costs associated with planned fossil maintenance as incurred. FPL recognizes costs associated with planned major nuclear maintenance in accordance with regulatory treatment. As part of the 2016 rate agreement, the FPSC authorized FPL to change its regulatory accounting treatment of nuclear maintenance costs. Therefore, in 2017, FPL began deferring the actual nuclear maintenance costs for each nuclear unit’s planned outage to a regulatory asset as the costs were incurred and amortizing the costs to O&M expense over the period from the end of the current outage to the end of the next planned outage. The deferred asset for nuclear maintenance costs at December 31, 2017 totaled approximately $65 million and is included in noncurrent regulatory assets on NEE’s and FPL’s consolidated balance sheets. Prior to 2017, FPL's estimated nuclear maintenance costs for each nuclear unit's next planned outage were accrued over the period from the end of the last outage to the end of the next planned outage. Any difference between the estimated and actual costs was included in O&M expenses when known. The accrued liability for nuclear maintenance costs at December 31, 2016 totaled approximately $65 million and is included in noncurrent regulatory liabilities on NEE's and FPL's consolidated balance sheets. For the years ended December 31, 2017, 2016 and 2015, FPL recognized approximately $42 million, $89 million and $90 million, respectively, in nuclear maintenance costs which are primarily included in O&M expenses in NEE's and FPL's consolidated statements of income. NEER uses the deferral method to account for certain planned major maintenance costs. NEER's major maintenance costs for its nuclear generation units and combustion turbines are capitalized and amortized on a unit of production method over the period from the end of the last outage to the beginning of the next planned outage. NEER's capitalized major maintenance costs, net of accumulated amortization, totaled approximately $79 million and $69 million at December 31, 2017 and 2016, respectively, and are included in noncurrent other assets on NEE's consolidated balance sheets. For the years ended December 31, 2017, 2016 and 2015, NEER amortized approximately $68 million, $74 million and $79 million in major maintenance costs which are included in O&M expenses in NEE's consolidated statements of income. Cash Equivalents - Cash equivalents consist of short-term, highly liquid investments with original maturities of three months or less. Restricted Cash - In the fourth quarter of 2017, NEE and FPL early adopted an accounting standards update which requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the consolidated statements of cash flows. NEE and FPL adopted the standards update retrospectively, which adoption did not have a material impact on NEE’s or FPL’s consolidated statements of cash flows. At December 31, 2017 and 2016, NEE had approximately $269 million ($141 million for FPL) and $237 million ($120 million for FPL), respectively, of restricted cash, of which approximately $247 million ($128 million for FPL) and $228 million ($120 million for FPL), respectively, is included in current other assets and the remaining balance is included in noncurrent other assets on NEE's and FPL's consolidated balance sheets. Restricted cash is primarily related to debt service payments, bond proceeds held for construction at FPL and margin cash collateral requirements. In addition, where offsetting positions exist, restricted cash related to margin cash collateral is netted against derivative instruments, which totaled $83 million at December 31, 2016. See Note 3. Allowance for Doubtful Accounts - FPL maintains an accumulated provision for uncollectible customer accounts receivable that is estimated using a percentage, derived from historical revenue and write-off trends, of the previous four months of revenue. Additional amounts are included in the provision to address specific items that are not considered in the calculation described above. NEER regularly reviews collectibility of its receivables and establishes a provision for losses estimated as a percentage of accounts receivable based on the historical bad debt write-off trends for its retail electricity provider operations and, when necessary, using the specific identification method for all other receivables. Inventory - FPL values materials, supplies and fossil fuel inventory using a weighted-average cost method. NEER's materials, supplies and fossil fuel inventories are carried at the lower of weighted-average cost and net realizable value, unless evidence indicates that the weighted-average cost (even if in excess of net realizable value) will be recovered with a normal profit upon sale in the ordinary course of business. Energy Trading - NEE provides full energy and capacity requirements services primarily to distribution utilities, which include load-following services and various ancillary services, in certain markets and engages in power and gas marketing and trading activities to optimize the value of electricity and fuel contracts, generation facilities and gas infrastructure assets, as well as to take advantage of projected favorable commodity price movements. Trading contracts that meet the definition of a derivative are accounted for at fair value and realized gains and losses from all trading contracts, including those where physical delivery is required, are recorded net for all periods presented. See Note 3. Securitized Storm-Recovery Costs, Storm Fund and Storm Reserve - In connection with the 2007 storm-recovery bond financing (see Note 8 - FPL), the net proceeds to FPL from the sale of the storm-recovery property were used primarily to reimburse FPL for its estimated net of tax deficiency in its storm and property insurance reserve (storm reserve) and provide for a storm and property insurance reserve fund (storm fund). Upon the issuance of the storm-recovery bonds, the storm reserve deficiency was reclassified to securitized storm-recovery costs which is recorded as a current and noncurrent regulatory asset on NEE's and FPL's consolidated balance sheets. As storm-recovery charges are billed to customers (which are included in operating revenues), the securitized storm-recovery costs are amortized and included in depreciation and amortization expense in NEE's and FPL's consolidated statements of income. Marketable securities held in the storm fund are classified as available for sale and are carried at fair value. See Note 4. Fund earnings, consisting of dividends, interest and realized gains and losses, net of taxes, are reinvested in the fund. Fund earnings, as well as any changes in unrealized gains and losses, are not recognized in income and are reflected as a corresponding adjustment to the storm reserve. The tax effects of amounts not yet recognized for tax purposes are included in deferred income taxes. During the fourth quarter of 2016, all available funds were withdrawn from the storm fund to pay for the storm restoration costs associated with Hurricane Hermine and Hurricane Matthew (see below regarding Hurricane Hermine and Hurricane Matthew). FPL was impacted by Hurricane Hermine and Hurricane Matthew in 2016 and Hurricane Irma in 2017. Hurricane Matthew and Hurricane Irma resulted in damage throughout much of FPL's service territory. Damage to FPL property from the hurricanes was primarily limited to the transmission and distribution systems. In March 2017, FPL began recovering from its retail customers, through an interim storm surcharge over a 12-month period, eligible storm restoration costs associated with Hurricane Matthew of approximately $201 million ($294 million of recoverable costs less $93 million available in FPL's storm reserve prior to the storm), plus approximately $117 million to replenish the storm reserve to the level authorized in FPL's 2012 rate agreement. The amount collected is subject to refund based on an FPSC prudence review, which hearings are scheduled for May 2018. As the portion of the Hurricane Matthew surcharge applicable to the replenishment of the storm reserve is billed to customers (which is recorded as operating revenues), the storm reserve will be recognized as a regulatory liability and charged to depreciation and amortization expense in NEE's and FPL's consolidated statements of income. At December 31, 2017, FPL had collected approximately $74 million of the storm reserve replenishment (included in noncurrent regulatory liabilities on NEE's and FPL's consolidated balance sheets), which provides capacity to absorb future prudently incurred storm restoration costs without seeking cost recovery approval from the FPSC. Accrued storm restoration costs were approximately $428 million at December 31, 2017 and are included in current other liabilities on NEE's and FPL's consolidated balance sheets. In December 2017, following the enactment of tax reform, FPL determined that it would not seek recovery of Hurricane Irma storm restoration costs of approximately $1.3 billion through a storm surcharge from customers and, as a result, the regulatory asset associated with Hurricane Irma was written off in December 2017 as storm restoration costs in NEE's and FPL's consolidated statements of income. As allowed under the 2016 rate agreement, FPL used available reserve amortization to offset nearly all of the expense, and plans to partially restore the reserve amortization through tax savings generated during the term of the 2016 rate agreement. In January 2018, the OPC filed a petition with the FPSC to investigate and adjust rates for all Florida investor-owned utilities, including FPL, related to the reduction in the federal corporate income tax rate as a result of tax reform. FPL believes that the benefits of tax reform will be realized by FPL's customers in accordance with the 2016 rate agreement as discussed above. See Note 5. Impairment of Long-Lived Assets - NEE evaluates long-lived assets for impairment when events or changes in circumstances indicate that the carrying amount may not be recoverable. An impairment loss is required to be recognized if the carrying value of the asset exceeds the undiscounted future net cash flows associated with that asset. The impairment loss to be recognized is the amount by which the carrying value of the long-lived asset exceeds the asset's fair value. In most instances, the fair value is determined by discounting estimated future cash flows using an appropriate interest rate. See Note 4 - Nonrecurring Fair Value Measurements. Goodwill and Other Intangible Assets - NEE's goodwill and other intangible assets are as follows:
| Weighted- Average Useful Lives |  | December 31,
|  | 2017 |  | 2016
| (years) |  | (millions)
Goodwill (by reporting unit): |  |  |  |  |
NEER segment: |  |  |  |  |
Gas infrastructure, primarily Texas pipelines |  |  | $ | 641 |  |  | $ | 641 |
Customer supply |  |  | 72 |  |  | 72 |
Generation assets |  |  | 40 |  |  | 38 |
Other |  |  | 11 |  |  | 28 |
Total goodwill |  |  | $ | 764 |  |  | $ | 779 |
Other intangible assets not subject to amortization, primarily land easements |  |  | $ | 138 |  |  | $ | 143 |
Other intangible assets subject to amortization: |  |  |  |  |
Customer relationships associated with gas infrastructure | 41 |  | $ | 700 |  |  | $ | 700 |
Purchased power agreements | 22 |  | 521 |  |  | 444 |
Other, primarily transmission and development rights and customer lists | 23 |  | 79 |  |  | 81 |
Total |  |  | 1,300 |  |  | 1,225 |
Accumulated amortization |  |  | (151 | ) |  | (115 | )
Total other intangible assets subject to amortization - net |  |  | $ | 1,149 |  |  | $ | 1,110 |
NEE's goodwill relates to various acquisitions which were accounted for using the purchase method of accounting. Other intangible assets subject to amortization are amortized, primarily on a straight-line basis, over their estimated useful lives. Amortization expense was approximately $35 million, $35 million and $17 million for the years ended December 31, 2017, 2016 and 2015, respectively, and is expected to be approximately $36 million, $35 million, $35 million, $35 million and $35 million for 2018, 2019, 2020, 2021 and 2022, respectively. Goodwill and other intangible assets are primarily included in noncurrent other assets on NEE's consolidated balance sheets. Goodwill and other intangible assets not subject to amortization are assessed for impairment at least annually by applying a fair value-based analysis. Other intangible assets subject to amortization are periodically reviewed when impairment indicators are present to assess recoverability from future operations using undiscounted future cash flows. Effective January 1, 2018, NEE and FPL adopted an accounting standards update that clarified the definition of a business. The revised guidance affects the evaluation of whether a transaction should be accounted for as an acquisition or disposition of an asset or a business. NEE and FPL adopted this guidance on a prospective basis effective January 1, 2018. Pension Plan - NEE allocates net periodic pension income to its subsidiaries based on the pensionable earnings of the subsidiaries' employees. Accounting guidance requires recognition of the funded status of the pension plan in the balance sheet, with changes in the funded status recognized in other comprehensive income within shareholders' equity in the year in which the changes occur. Since NEE is the plan sponsor, and its subsidiaries do not have separate rights to the plan assets or direct obligations to their employees, this accounting guidance is reflected at NEE and not allocated to the subsidiaries. The portion of previously unrecognized actuarial gains and losses and prior service costs or credits that are estimated to be allocable to FPL as net periodic (income) cost in future periods and that otherwise would be recorded in accumulated other comprehensive income (AOCI) are classified as regulatory assets and liabilities at NEE in accordance with regulatory treatment. Stock-Based Compensation - NEE accounts for stock-based payment transactions based on grant-date fair value. Compensation costs for awards with graded vesting are recognized on a straight-line basis over the requisite service period for the entire award. Forfeitures of stock-based awards are recognized as they occur. See Note 10 - Stock-Based Compensation. Retirement of Long-Term Debt - Gains and losses that result from differences in FPL's reacquisition cost and the net book value of long-term debt which is retired are deferred as a regulatory asset or liability and amortized to interest expense ratably over the remaining life of the original issue, which is consistent with its treatment in the ratemaking process. NEECH and NEER recognize such differences in interest expense at the time of retirement. Income Taxes - Deferred income taxes are recognized on all significant temporary differences between the financial statement and tax bases of assets and liabilities, and are presented as noncurrent on NEE's and FPL's consolidated balance sheets. In connection with the tax sharing agreement between NEE and certain of its subsidiaries, the income tax provision at each applicable subsidiary reflects the use of the "separate return method," except that tax benefits that could not be used on a separate return basis, but are used on the consolidated tax return, are recorded by the subsidiary that generated the tax benefits. Any remaining consolidated income tax benefits or expenses are recorded at the corporate level. Included in other regulatory assets and other regulatory liabilities on NEE's and FPL's consolidated balance sheets is the revenue equivalent of the difference in deferred income taxes computed under accounting rules, as compared to regulatory accounting rules. The net regulatory liability totaled $4,213 million ($4,180 million for FPL) at December 31, 2017 and the net regulatory asset totaled $289 million ($266 million for FPL) at December 31, 2016, and is being amortized in accordance with the regulatory treatment over the estimated lives of the assets or liabilities for which the deferred tax amount was initially recognized. Production tax credits (PTCs) are recognized as wind energy is generated and sold based on a per kWh rate prescribed in applicable federal and state statutes and are recorded as a reduction of current income taxes payable, unless limited by tax law in which instance they are recorded as deferred tax assets. NEER recognizes ITCs as a reduction to income tax expense when the related energy property is placed into service. FPL recognizes ITCs as a reduction to income tax expense over the depreciable life of the related energy property. At December 31, 2017 and 2016, FPL’s accumulated deferred ITCs were approximately $119 million and $123 million, respectively, and are included in noncurrent regulatory liabilities on NEE's and FPL's consolidated balance sheets. NEE and FPL record a deferred income tax benefit created by the convertible ITCs on the difference between the financial statement and tax bases of renewable property. For NEER, this deferred income tax benefit is recorded in income tax expense in the year that the renewable property is placed in service. For FPL, this deferred income tax benefit is offset by a regulatory liability, which is amortized as a reduction of depreciation expense over the approximate lives of the related renewable property in accordance with the regulatory treatment. At December 31, 2017 and 2016, the net deferred income tax benefits associated with FPL's convertible ITCs were approximately $44 million and $46 million, respectively, and are included in noncurrent regulatory assets and noncurrent regulatory liabilities on NEE's and FPL's consolidated balance sheets. A valuation allowance is recorded to reduce the carrying amounts of deferred tax assets when it is more likely than not that such assets will not be realized. NEE recognizes interest income (expense) related to unrecognized tax benefits (liabilities) in interest income and interest expense, respectively, net of the amount deferred at FPL. At FPL, the offset to accrued interest receivable (payable) on income taxes is classified as a regulatory liability (regulatory asset) which will be amortized to income (expense) over a five-year period upon settlement in accordance with regulatory treatment. All tax positions taken by NEE in its income tax returns that are recognized in the financial statements must satisfy a more-likely-than-not threshold. NEE and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various states, the most significant of which is Florida, and certain foreign jurisdictions. Federal tax liabilities, with the exception of certain refund claims, are effectively settled for all years prior to 2013. State and foreign tax liabilities, which have varied statutes of limitations regarding additional assessments, are generally effectively settled for years prior to 2009. At December 31, 2017, NEE had unrecognized tax benefits of approximately $71 million that, if disallowed, could impact the annual effective income tax rate. The amounts of unrecognized tax benefits and related interest accruals may change within the next 12 months; however, NEE and FPL do not expect these changes to have a significant impact on NEE’s or FPL’s financial statements. See Note 5. Sale of Differential Membership Interests - Certain subsidiaries of NEER sold their Class B membership interest in entities that have ownership interests in wind and solar facilities, with generating capacity totaling approximately 8,197 MW and 374 MW, respectively, at December 31, 2017, to third-party investors. In exchange for the cash received, the holders of the Class B membership interests will receive a portion of the economic attributes of the facilities, including income tax attributes, for variable periods. The proceeds received were deferred and recorded as a liability in deferral related to differential membership interests - VIEs on NEE's consolidated balance sheets. The deferred amount was being recognized in benefits associated with differential membership interests - net in NEE's consolidated statements of income as the Class B members receive their portion of the economic attributes. See Accounting for Partial Sales of Nonfinancial Assets below. NEE continues to operate and manage the wind and solar facilities, and consolidates the entities that own the wind and solar facilities. Variable Interest Entities (VIEs) - An entity is considered to be a VIE when its total equity investment at risk is not sufficient to permit the entity to finance its activities without additional subordinated financial support, or its equity investors, as a group, lack the characteristics of having a controlling financial interest. A reporting company is required to consolidate a VIE as its primary beneficiary when it has both the power to direct the activities of the VIE that most significantly impact the VIE's economic performance, and the obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. NEE and FPL evaluate whether an entity is a VIE whenever reconsideration events as defined by the accounting guidance occur. See Note 8. Leases - In February 2016, the Financial Accounting Standards Board issued an accounting standards update which requires, among other things, that lessees recognize a lease liability, initially measured at the present value of the future lease payments, and a right-of-use asset for all leases (with the exception of short-term leases). This standards update also requires new qualitative and quantitative disclosures for both lessees and lessors. This standards update will be effective for NEE and FPL beginning January 1, 2019. Early adoption is permitted. NEE and FPL are currently reviewing their portfolio of contracts and evaluating the proper application of the standards update to these contracts in order to determine the impact the adoption will have on their consolidated financial statements. NEE and FPL are implementing a number of system enhancements to facilitate the identification, tracking and reporting of leases based upon the requirements of this standards update. NEE and FPL anticipate adopting this standards update on January 1, 2019. Accounting for Partial Sales of Nonfinancial Assets - Effective January 1, 2018, NEE and FPL adopted an accounting standards update regarding the accounting for partial sales of nonfinancial assets. This standards update affects the accounting and related financial statement presentation for the sales of differential membership interests to third-party investors and the sales of NEER assets to indirect subsidiaries of NEP and was adopted using the modified retrospective approach, resulting in cumulative effects being recognized on January 1, 2018. For the sales of differential membership interests to third-party investors, NEE recorded an increase to retained earnings of approximately $50 million and a reduction to additional paid-in capital of $70 million on January 1, 2018. In addition to the cumulative effects, the liability reflected as deferral related to differential membership interests - VIEs on NEE's consolidated balance sheets at December 31, 2017 was reclassified to noncontrolling interests on January 1, 2018. In future periods, as tax equity investors receive their portion of the economic attributes, NEE will record a reduction to net income attributable to noncontrolling interests. Additionally, the profit sharing liability associated with the sales of NEER assets to NEP was eliminated and NEE recorded an increase to additional paid-in capital of approximately $830 million and a reduction to retained earnings of approximately $50 million on January 1, 2018. The adoption of this standards update did not have an impact on FPL. Merger Terminations - From July 2016 through October 2016, NEE and certain of its affiliates entered into several agreements with Energy Future Holdings Corp. (EFH) and Energy Future Intermediate Holding Company LLC (EFIH), Texas Transmission Holdings Corporation (TTHC), Oncor Management Investment LLC and certain of their affiliates, which would have resulted in NEE owning 100% of Oncor Electric Delivery Company LLC (Oncor) if the transactions contemplated by those agreements would have been consummated. The agreements with EFH and EFIH and TTHC were subject to, among other things, approval by the Public Utility Commission of Texas (PUCT). In April 2017, the PUCT issued a final order denying NEE's purchase of Oncor. In July 2017, EFH and EFIH provided a written notice to NEE terminating the agreement and plan of merger, dated as of July 29, 2016, as amended (merger agreement), under which EFH Merger Co., LLC, a direct wholly owned subsidiary of NEE, would have acquired 100% of the equity of reorganized EFH and certain of its subsidiaries, including its indirect ownership of approximately 80% of the outstanding equity interests of Oncor. Subsequently, NEE, EFH and EFIH and a large creditor of EFIH commenced legal proceedings in the U.S. Bankruptcy Court for the District of Delaware (bankruptcy court) in which the chapter 11 bankruptcy proceedings of EFH and EFIH are taking place to determine whether NEE is entitled to receive the $275 million termination fee to which NEE believes it is entitled under the merger agreement and a September 2016 order of the bankruptcy court approving the termination fee payment provisions of the merger agreement (2016 termination fee approval order). In October 2017, the judge presiding over these proceedings issued an opinion and order in one of these legal proceedings that the bankruptcy court's issuance of the 2016 termination fee approval order was based upon a fundamental misapprehension of critical facts by the bankruptcy court and, accordingly, ordered that EFH and EFIH are not authorized to pay the fee. NEE has appealed this decision and believes it is erroneous. Until that appeal is ultimately resolved, the remaining legal proceedings in the bankruptcy court between NEE, EFH and EFIH and the large creditor of EFIH as to whether NEE would be entitled to the termination fee if the foregoing appeal is successful have been stayed. In October 2017, the agreement and plan of merger, dated as of October 30, 2016, pursuant to which a direct wholly owned subsidiary of NEE would have merged with TTHC, was terminated with no material impact to NEE. In 2014, NEE and Hawaiian Electric Industries, Inc. (HEI) entered into an Agreement and Plan of Merger (the HEI merger agreement) pursuant to which Hawaiian Electric Company, Inc. (HECO), HEI's wholly owned electric utility subsidiary, was to become a wholly owned subsidiary of NEE. In July 2016, the Hawaii Public Utilities Commission issued an order dismissing NEE's and HECO's merger application and, as a result, NEE terminated the HEI merger agreement. Pursuant to the terms of the HEI merger agreement, NEE paid HEI a termination fee of $90 million plus reimbursement to HEI for out-of-pocket expenses incurred in connection with the HEI merger agreement of $5 million, which is included in merger-related expenses in NEE's consolidated statements of income for the year ended December 31, 2016. Assets and Liabilities Associated with Assets Held for Sale - In November 2017, a subsidiary of NEER entered into an agreement to sell its ownership interests in a portfolio of seven wind farms located in California, Pennsylvania and West Virginia with a total generating capacity of 244 MW at December 31, 2017. The carrying amounts of the major classes of assets and liabilities related to the facilities that were classified as held for sale on NEE's consolidated balance sheets at December 31, 2017 primarily represent property, plant and equipment and the related long-term debt. In January 2017, an indirect wholly owned subsidiary of NEE completed the sale of its membership interests in its fiber-optic telecommunications business for net cash proceeds of approximately $1.1 billion, after repayment of $370 million of related long-term debt. In connection with the sale and the related consolidating state income tax effects, a gain of approximately $1.1 billion (approximately $685 million after tax) was recorded in NEE's consolidated statements of income for the year ended December 31, 2017 and is included in losses (gains) on disposal of a business/assets - net. The carrying amounts of the major classes of assets and liabilities related to the fiber-optic telecommunications business that were classified as held for sale on NEE's consolidated balance sheets at December 31, 2016 primarily represent property, plant and equipment and the related long-term debt. In 2016, a subsidiary of NEER completed the sale of its ownership interest in merchant natural gas generation facilities located in Texas with a total generating capacity of 2,884 MW for net cash proceeds of approximately $456 million, after transaction costs and working capital adjustments. In connection with the sale and the related consolidating state income tax effects, a gain of approximately $254 million ($106 million after tax) was recorded in NEE's consolidated statements of income for the year ended December 31, 2016 and is included in losses (gains) on disposal of a business/assets - net. In 2016, a subsidiary of NEER completed the sale of its ownership interest in natural gas generation facilities located primarily in Pennsylvania with a total generating capacity of 840 MW for net cash proceeds of approximately $260 million, after transaction costs and working capital adjustments. In connection with the sale and the related consolidating state income tax effects, a gain of approximately $191 million ($113 million after tax) was recorded in NEE's consolidated statements of income for the year ended December 31, 2016 and is included in losses (gains) on disposal of a business/assets - net.

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for all significant accounting policies of the reporting entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
Name: | us-gaap_SignificantAccountingPoliciesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration