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Taxes (Details 1) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Reconciliation of federal income tax expense at the federal statutory rate to the total provision for income taxes |  |  |  |  |  |  |  |  |  |  |
Income (loss) from Continuing Operations before income taxes (benefits) |  |  |  |  |  |  |  |  | $ (9,232) | $ 893 | $ 171
Federal income tax expense (benefit) at statutory rate (35%) |  |  |  |  |  |  |  |  | (3,231) | 313 | 60
Increases (reductions) in taxes resulting from- |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | (192) | 17 | (21)
AFUDC equity and other flow-through |  |  |  |  |  |  |  |  | (13) | (16) | (13)
Amortization of investment tax credits |  |  |  |  |  |  |  |  | (8) | (8) | (10)
Change in accounting method |  |  |  |  |  |  |  |  | 0 | (8) | (27)
ESOP dividend |  |  |  |  |  |  |  |  | (6) | (6) | (6)
Impairment of non-deductible goodwill |  |  |  |  |  |  |  |  | 157 | 0 | 0
Tax basis balance sheet adjustments |  |  |  |  |  |  |  |  | 0 | 0 | (25)
Uncertain tax positions |  |  |  |  |  |  |  |  | (16) | 1 | (35)
Valuation allowances |  |  |  |  |  |  |  |  | 246 | 18 | 33
Other, net |  |  |  |  |  |  |  |  | 8 | 4 | 2
Total provision for income taxes (benefits) | $ (3,389) | $ 251 | $ (130) | $ 213 | $ (170) | $ 226 | $ 115 | $ 144 | $ (3,055) | $ 315 | $ (42)
Effective income tax rate (percent) |  |  |  |  |  |  |  |  | 33.10% | 35.30% | (24.60%)
FES |  |  |  |  |  |  |  |  |  |  |
Reconciliation of federal income tax expense at the federal statutory rate to the total provision for income taxes |  |  |  |  |  |  |  |  |  |  |
Income (loss) from Continuing Operations before income taxes (benefits) |  |  |  |  |  |  |  |  | $ (8,444) | $ 147 | $ (588)
Federal income tax expense (benefit) at statutory rate (35%) |  |  |  |  |  |  |  |  | (2,955) | 51 | (206)
Increases (reductions) in taxes resulting from- |  |  |  |  |  |  |  |  |  |  |
State income taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | (188) | 2 | (28)
Amortization of investment tax credits |  |  |  |  |  |  |  |  | (2) | (2) | (4)
ESOP dividend |  |  |  |  |  |  |  |  | (1) | (1) | (1)
Impairment of non-deductible goodwill |  |  |  |  |  |  |  |  | 9 | 0 | 0
Uncertain tax positions |  |  |  |  |  |  |  |  | (8) | 5 | 0
Valuation allowances |  |  |  |  |  |  |  |  | 151 | 14 | 14
Other, net |  |  |  |  |  |  |  |  | 6 | (4) | (3)
Total provision for income taxes (benefits) | $ (2,983) | $ 56 | $ (143) | $ 82 | $ 1 | $ 70 | $ (4) | $ (2) | $ (2,988) | $ 65 | $ (228)
Effective income tax rate (percent) |  |  |  |  |  |  |  |  | 35.40% | 44.20% | 38.80%

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