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Income Tax - Schedule of Components of Income Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
State |  |  |
Current | $ (12) | $ (10) | $ (2)
Deferred | 96 | 107 | 103
Federal |  |  |
Current | 0 | 3 | (11)
Deferred | 219 | 310 | 391
Amortization of investment tax credits | (7) | (9) | (9)
Total income tax expense | 296 | 401 | 472
CECONY |  |  |
State |  |  |
Current | 22 | 6 | 37
Deferred | 68 | 82 | 75
Federal |  |  |
Current | 185 | (34) | 73
Deferred | 63 | 275 | 504
Amortization of investment tax credits | (3) | (3) | (4)
Total income tax expense | $ 335 | $ 326 | $ 685

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