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Income Taxes (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 31, 2018 | Sep. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Effective income tax rate (as a percent) |  | 12.00% |  | 30.00% | 23.00% | 29.00% |
Production tax credits |  | $ 19 |  | $ 27 | $ 63 | $ 85 |
Deferred income tax benefit associated with convertible investment tax credits |  | $ 34 |  | $ 51 | $ 104 | $ 220 |
Tax Cuts and Jobs Act of 2017, income tax expense (benefit) |  |  | $ 125 |  |  |  |
Production tax credit (PTC), roll off period |  |  |  |  | 10 years |  |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit |  |  |  |  |  |  | $ 6,500
FPL [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit |  |  |  |  |  |  | 4,500
NextEra Energy Resources [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, income tax (expense) benefit |  |  |  |  |  |  | $ 2,000
Accounting Standards Update 2018-02 [Member] | New Accounting Pronouncement, Early Adoption, Effect [Member] |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Cumulative effect on retained earnings, after tax | $ 16 |  |  |  |  |  |

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