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Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Federal: |  |  |
Current | $ 100 | $ 72 | $ 10
Deferred | (1,040) | 1,075 | 1,194
Total federal | (940) | 1,147 | 1,204
State: |  |  |
Current | 88 | 76 | 31
Deferred | 199 | 160 | (7)
Total state | 287 | 236 | 24
Total income tax expense (benefit) | (653) | 1,383 | 1,228
FPL[Member] |  |  |
Federal: |  |  |
Current | 168 | 72 | 423
Deferred | 776 | 830 | 399
Total federal | 944 | 902 | 822
State: |  |  |
Current | 29 | 57 | 58
Deferred | 133 | 92 | 77
Total state | 162 | 149 | 135
Total income tax expense (benefit) | $ 1,106 | $ 1,051 | $ 957

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