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Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Currently payable (receivable)- |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | $ 14 | $ (1) | $ 1
State |  |  |  |  |  |  |  |  | 42 | 9 | 30
Currently payable (receivable) Total |  |  |  |  |  |  |  |  | 56 | 8 | 31
Deferred, net- |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 876 | (3,114) | 277
State |  |  |  |  |  |  |  |  | (29) | 59 | 15
Deferred Tax Total |  |  |  |  |  |  |  |  | 847 | (3,055) | 292
Investment tax credit amortization |  |  |  |  |  |  |  |  | (8) | (8) | (8)
Total provision for income taxes (benefits) | $ 413 | $ 239 | $ 117 | $ 126 | $ (3,389) | $ 251 | $ (130) | $ 213 | 895 | (3,055) | 315
FES |  |  |  |  |  |  |  |  |  |  |
Currently payable (receivable)- |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | (159) | (67) | (56)
State |  |  |  |  |  |  |  |  | (1) | (1) | 2
Currently payable (receivable) Total |  |  |  |  |  |  |  |  | (160) | (68) | (54)
Deferred, net- |  |  |  |  |  |  |  |  |  |  |
Federal |  |  |  |  |  |  |  |  | 509 | (2,861) | 103
State |  |  |  |  |  |  |  |  | (52) | (57) | 18
Deferred Tax Total |  |  |  |  |  |  |  |  | 457 | (2,918) | 121
Investment tax credit amortization |  |  |  |  |  |  |  |  | (2) | (2) | (2)
Total provision for income taxes (benefits) | $ 281 | $ 32 | $ 23 | $ (41) | $ (2,983) | $ 56 | $ (143) | $ 82 | $ 295 | $ (2,988) | $ 65

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