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Asset Retirement Obligations | 12 Months Ended
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Dec. 31, 2017
Asset Retirement Obligations [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations FPL's AROs relate primarily to the nuclear decommissioning obligations of its nuclear units. FPL's AROs other than nuclear decommissioning obligations are not significant. The accounting provisions result in timing differences in the recognition of legal asset retirement costs for financial reporting purposes and the method the FPSC allows FPL to recover in rates. NEER's AROs relate primarily to the nuclear decommissioning obligations of its nuclear plants and obligations for the dismantlement of certain of its wind and solar facilities. See Note 1 - Decommissioning of Nuclear Plants, Dismantlement of Plants and Other Accrued Asset Removal Costs. A rollforward of NEE's and FPL's AROs is as follows:
| FPL |  | NEER |  | NEE
|  |  | (millions) |  |
Balances, December 31, 2015 | $ | 1,822 |  |  | $ | 647 |  |  | $ | 2,469 |
Liabilities incurred | 1 |  |  | 56 |  |  | 57 |
Accretion expense | 91 |  |  | 47 |  |  | 138 |
Liabilities settled | — |  |  | (2 | ) |  | (2 | )
Revision in estimated cash flows - net | 5 |  |  | 69 |  | (a) | 74 |
Balances, December 31, 2016 | 1,919 |  |  | 817 |  |  | 2,736 |
Liabilities incurred | 17 |  |  | 59 |  |  | 76 |
Accretion expense | 96 |  |  | 52 |  |  | 148 |
Liabilities settled | — |  |  | (14 | ) | (b) | (14 | )
Revision in estimated cash flows - net | 15 |  |  | 70 |  | (c) | 85 |
Balances, December 31, 2017 | $ | 2,047 |  |  | $ | 984 |  |  | $ | 3,031 |
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(a) | Primarily reflects the effect of revised cost estimates to dismantle certain of NEER’s wind and solar facilities.
(b) | Includes approximately $13 million reclassified to liabilities associated with assets held for sale in NEE's consolidated balance sheets. See Note 1 - Assets and Liabilities Associated with Assets Held for Sale.
(c) | Primarily reflects the effect of the revised cost estimate due to the change in useful life of Duane Arnold. See Note 4 - Nonrecurring Fair Value Measurements.
Restricted funds for the payment of future expenditures to decommission NEE's and FPL's nuclear units included in special use funds on NEE's and FPL's consolidated balance sheets are as follows (see Note 4 - Special Use Funds):
| FPL |  | NEER |  | NEE
|  |  | (millions) |  |
Balances, December 31, 2017 | $ | 4,090 |  |  | $ | 1,913 |  |  | $ | 6,003 |
Balances, December 31, 2016 | $ | 3,665 |  |  | $ | 1,769 |  |  | $ | 5,434 |
NEE and FPL have identified but not recognized ARO liabilities related to electric transmission and distribution assets resulting from easements over property not owned by NEE or FPL. These easements are generally perpetual and only require retirement action upon abandonment or cessation of use of the property or facility for its specified purpose. The ARO liability is not estimable for such easements as NEE and FPL intend to use these properties indefinitely. In the event NEE and FPL decide to abandon or cease the use of a particular easement, an ARO liability would be recorded at that time.

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- Definition Asset Retirement Obligations [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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