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Taxes (Details 1) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of federal income tax expense at the federal statutory rate to the total provision for income taxes |  |  |  |  |  |  |  |  |  |  |
Income from Continuing Operations, before income taxes |  |  |  |  |  |  |  |  | $ 1,117 | $ 1,512 | $ 1,426
Federal income tax expense at statutory rate (21%, 21%, and 35% for 2019, 2018, and 2017, respectively) |  |  |  |  |  |  |  |  | 235 | 318 | 499
Increases (reductions) in taxes resulting from- |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 96 | 90 | 40
AFUDC equity and other flow-through |  |  |  |  |  |  |  |  | (36) | (31) | (15)
Amortization of investment tax credits |  |  |  |  |  |  |  |  | (5) | (5) | (6)
ESOP dividend |  |  |  |  |  |  |  |  | (3) | (3) | (5)
Remeasurement of deferred taxes |  |  |  |  |  |  |  |  | 0 | 24 | 1,193
WV unitary group remeasurement |  |  |  |  |  |  |  |  | 0 | 126 | 0
Excess deferred tax amortization due to the Tax Act |  |  |  |  |  |  |  |  | (74) | (60) | 0
Uncertain tax positions |  |  |  |  |  |  |  |  | (11) | 2 | (3)
Valuation allowances |  |  |  |  |  |  |  |  | 5 | 21 | 11
Other, net |  |  |  |  |  |  |  |  | 6 | 8 | 1
Total income taxes | $ (68) | $ 107 | $ 81 | $ 93 | $ 35 | $ 121 | $ 101 | $ 233 | $ 213 | $ 490 | $ 1,715
Effective income tax rate (percent) |  |  |  |  |  |  |  |  | 19.10% | 32.40% | 120.30%

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