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Income Taxes - Components of Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Federal: |  |  |
Current | $ 167 | $ 30 | $ 100
Deferred | 115 | 1,153 | (1,047)
Total federal | 282 | 1,183 | (947)
State: |  |  |
Current | 23 | 63 | 88
Deferred | 143 | 330 | 199
Total state | 166 | 393 | 287
Total income tax expense (benefit) | 448 | 1,576 | (660)
FPL[Member] |  |  |
Federal: |  |  |
Current | 348 | 251 | 168
Deferred | (29) | 134 | 776
Total federal | 319 | 385 | 944
State: |  |  |
Current | 49 | 91 | 29
Deferred | 73 | 63 | 133
Total state | 122 | 154 | 162
Total income tax expense (benefit) | $ 441 | $ 539 | $ 1,106

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