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Debt (Schedule of Debt Instruments) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |
Less current maturities of long-term debt | $ 1,676 | $ 2,604
Long-term debt, excluding current maturities | 31,463 | 27,818
Variable rate tax exempt bonds | 838 |
liabilities associated with assets held-for-sale [Member] |  |
Debt Instrument [Line Items] |  |
Total long-term debt | 373 | 373
FPL[Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs and discount | (105) | (108)
Total long-term debt | 11,702 | 10,072
Less current maturities of long-term debt | 466 | 367
Long-term debt, excluding current maturities | 11,236 | 9,705
FPL[Member] | First mortgage bonds - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 9,145 | $ 8,690
Weighted-average interest rate | 4.70% | 4.78%
FPL[Member] | Storm-recovery bonds - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 144 | $ 210
Weighted-average interest rate | 5.26% | 5.26%
FPL[Member] | Pollution control, solid waste disposal and industrial development revenue bonds - variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 966 | $ 778
Weighted-average interest rate | 2.12% | 0.77%
FPL[Member] | Other long-term debt - variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,501 | $ 450
Weighted-average interest rate | 2.01% | 1.66%
FPL[Member] | Other long-term debt - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 51 | $ 52
Weighted-average interest rate | 5.10% | 5.09%
Capital Holdings [Member] |  |
Debt Instrument [Line Items] |  |
Fair value hedge adjustment | $ 1 | $ 8
Unamortized debt issuance costs and discount | (94) | (101)
Total long-term debt | 11,256 | 11,206
Less current maturities of long-term debt | 645 | 1,724
Long-term debt, excluding current maturities | 10,611 | 9,482
Capital Holdings [Member] | Other long-term debt - variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 52 | $ 60
Weighted-average interest rate | 2.58% | 1.77%
Capital Holdings [Member] | Other long-term debt - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 920 | $ 924
Weighted-average interest rate | 2.46% | 2.45%
Capital Holdings [Member] | Debentures - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 4,100 | $ 4,100
Weighted-average interest rate | 3.00% | 2.87%
Capital Holdings [Member] | Debentures, related to NEE's equity units - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 2,200 | $ 2,200
Weighted-average interest rate | 1.88% | 1.88%
Capital Holdings [Member] | Junior subordinated debentures - primarily fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 3,456 | $ 3,460
Weighted-average interest rate | 4.79% | 5.40%
Capital Holdings [Member] | Japanese yen denominated senior notes - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 89 | $ 85
Weighted-average interest rate | 5.13% | 5.13%
Capital Holdings [Member] | Japanese yen denominated term loans - variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 532 | $ 470
Weighted-average interest rate | 2.76% | 1.83%
NEER [Member] |  |
Debt Instrument [Line Items] |  |
Unamortized debt issuance costs and premium - net | $ (181) | $ (168)
Total long-term debt | 10,181 | 9,144
Less current maturities of long-term debt | 565 | 513
Long-term debt, excluding current maturities | 9,616 | 8,631
NEER [Member] | Senior secured limited-recourse bonds and notes - fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 2,114 | $ 2,091
Weighted-average interest rate | 5.74% | 6.00%
NEER [Member] | Senior secured limited-recourse term loans - primarily variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 5,165 | $ 4,959
Weighted-average interest rate | 3.32% | 2.78%
NEER [Member] | Senior Unsecured Notes - Fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,100 | $ 0
Weighted-average interest rate | 4.38% |
NEER [Member] | Senior Unsecured NEP Convertible Notes - Fixed [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 300 | 0
Weighted-average interest rate | 1.50% |
NEER [Member] | Other long-term debt - primarily variable [Member] |  |
Debt Instrument [Line Items] |  |
Long-term debt, gross | $ 1,683 | $ 2,262
Weighted-average interest rate | 3.29% | 2.97%
Wholly-Owned Subsidiary of NEER [Member] |  |
Debt Instrument [Line Items] |  |
Debt collateralized by third party note receivable | $ 483 | $ 490
NEP [Member] |  |
Debt Instrument [Line Items] |  |
Debt conversion, converted instrument, rate | 0.018917 |

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