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Income Tax - Schedule of Components of Income Tax (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
State |  |  |
Current | $ 7 | $ (12) | $ (10)
Deferred | 50 | 96 | 107
Federal |  |  |
Current | (2) | 0 | 3
Deferred | 42 | 219 | 310
Amortization of investment tax credits | (7) | (7) | (9)
Total income tax expense | 90 | 296 | 401
CECONY |  |  |
State |  |  |
Current | 6 | 22 | 6
Deferred | 97 | 68 | 82
Federal |  |  |
Current | 41 | 185 | (34)
Deferred | 73 | 63 | 275
Amortization of investment tax credits | (2) | (3) | (3)
Total income tax expense | $ 215 | $ 335 | $ 326

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