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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Debt Issuances and Borrowings by Subsidiaries | Long-term debt consists of the following:
|  |  | December 31,
|  |  | 2017 |  | 2016
| Maturity Date |  | Balance |  | Weighted- Average Interest Rate |  | Balance |  | Weighted- Average Interest Rate
|  |  | (millions) |  |  |  | (millions) |  |
FPL: |  |  |  |  |  |  |  |  |
First mortgage bonds - fixed | 2017 - 2047 |  | $ | 9,145 |  |  | 4.70 | % |  | $ | 8,690 |  |  | 4.78 | %
Storm-recovery bonds - fixed(a) | 2021 |  | 144 |  |  | 5.26 | % |  | 210 |  |  | 5.26 | %
Pollution control, solid waste disposal and industrial development revenue bonds - primarily variable(b) | 2020 - 2047 |  | 966 |  |  | 2.12 | % |  | 778 |  |  | 0.77 | %
Other long-term debt - variable(c) | 2018 - 2021 |  | 1,501 |  |  | 2.01 | % |  | 450 |  |  | 1.66 | %
Other long-term debt - fixed | 2017 - 2040 |  | 51 |  |  | 5.10 | % |  | 52 |  |  | 5.09 | %
Unamortized debt issuance costs and discount |  |  | (105 | ) |  |  |  | (108 | ) |  |
Total long-term debt of FPL |  |  | 11,702 |  |  |  |  | 10,072 |  |  |
Less current maturities of long-term debt |  |  | 466 |  |  |  |  | 367 |  |  |
Long-term debt of FPL, excluding current maturities |  |  | 11,236 |  |  |  |  | 9,705 |  |  |
NEECH: |  |  |  |  |  |  |  |  |  |
Debentures - fixed(d) | 2017 - 2027 |  | 4,100 |  |  | 3.00 | % |  | 4,100 |  |  | 2.87 | %
Debentures, related to NEE's equity units - fixed | 2020 - 2021 |  | 2,200 |  |  | 1.88 | % |  | 2,200 |  |  | 1.88 | %
Junior subordinated debentures - primarily fixed(d) | 2044 - 2077 |  | 3,456 |  |  | 4.79 | % |  | 3,460 |  |  | 5.40 | %
Japanese yen denominated senior notes - fixed(d) | 2030 |  | 89 |  |  | 5.13 | % |  | 85 |  |  | 5.13 | %
Japanese yen denominated term loans - variable(c)(d) | 2017 - 2020 |  | 532 |  |  | 2.76 | % |  | 470 |  |  | 1.83 | %
Other long-term debt - fixed | 2017 - 2044 |  | 920 |  |  | 2.46 | % |  | 924 |  |  | 2.45 | %
Other long-term debt - variable(c) | 2019 |  | 52 |  |  | 2.58 | % |  | 60 |  | (e) | 1.77 | %
Fair value hedge adjustment |  |  | 1 |  |  |  |  | 8 |  |  |
Unamortized debt issuance costs and discount |  |  | (94 | ) |  |  |  | (101 | ) |  |
Total long-term debt of NEECH |  |  | 11,256 |  |  |  |  | 11,206 |  |  |
Less current maturities of long-term debt |  |  | 645 |  |  |  |  | 1,724 |  |  |
Long-term debt of NEECH, excluding current maturities |  |  | 10,611 |  |  |  |  | 9,482 |  |  |
NEER: |  |  |  |  |  |  |  |  |  |
Senior secured limited-recourse bonds and notes - fixed (f) | 2019 - 2038 |  | 2,114 |  |  | 5.74 | % |  | 2,091 |  |  | 6.00 | %
Senior secured limited-recourse term loans - primarily variable(c)(d) | 2019 - 2037 |  | 5,165 |  |  | 3.32 | % |  | 4,959 |  |  | 2.78 | %
Senior unsecured notes - fixed(d) | 2024 - 2027 |  | 1,100 |  |  | 4.38 | % |  | — |  |  |
Senior unsecured NEP convertible notes - fixed(g) | 2020 |  | 300 |  |  | 1.50 | % |  | — |  |  |
Other long-term debt - primarily variable(c)(d) | 2017 - 2040 |  | 1,683 |  |  | 3.29 | % |  | 2,262 |  |  | 2.97 | %
Unamortized debt issuance costs and premium - net |  |  | (181 | ) |  |  |  | (168 | ) |  |
Total long-term debt of NEER |  |  | 10,181 |  |  |  |  | 9,144 |  |  |
Less current maturities of long-term debt |  |  | 565 |  |  |  |  | 513 |  |  |
Long-term debt of NEER, excluding current maturities |  |  | 9,616 |  |  |  |  | 8,631 |  |  |
Total long-term debt |  |  | $ | 31,463 |  |  |  |  | $ | 27,818 |  |  |
______________________
(a) | Principal on the storm-recovery bonds is due on the final maturity date (the date by which the principal must be repaid to prevent a default) for each tranche, however, it is being paid semiannually and sequentially.
(b) | Includes approximately $838 million of variable rate tax exempt bonds that permit individual bond holders to tender the bonds for purchase at any time prior to maturity. In the event these variable rate tax exempt bonds are tendered for purchase, they would be remarketed by a designated remarketing agent in accordance with the related indenture. If the remarketing is unsuccessful, FPL would be required to purchase the variable rate tax exempt bonds. At December 31, 2017, all variable rate tax exempt bonds tendered for purchase have been successfully remarketed. FPL's bank revolving line of credit facilities are available to support the purchase of the variable rate tax exempt bonds. Variable interest rate is established at various intervals by the remarketing agent.
(c) | Variable rate is based on an underlying index plus a margin.
(d) | Interest rate contracts, primarily swaps, have been entered into with respect to certain of these debt issuances. Additionally, foreign currency contracts have been entered into with respect to the Japanese yen denominated debt. See Note 3.
(e) | Excludes debt totaling $373 million reflected in liabilities associated with assets held for sale on NEE's consolidated balance sheets. See Note 1 - Assets and Liabilities Associated with Assets Held for Sale.
(f) | Includes approximately $483 million in 2017 and $490 million in 2016 of debt held by a wholly owned subsidiary of NEER and collateralized by a third-party note receivable held by that subsidiary. See Note 8 - NEER.
(g) | A holder may convert all or a portion of its notes into NEP common units and cash in lieu of any fractional common unit at the conversion rate. At December 31, 2017, the conversion rate, subject to certain adjustments, is 18.9170 NEP common units per $1,000 principal amount of the convertible notes.

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- Definition Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28541-108399 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 + Details
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