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Taxes (Details 1) - 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
Reconciliation of federal income tax expense at the federal statutory rate to the total provision for income taxes
Income (loss) before income taxes (benefits)									$ (829)	$ (9,232)	$ 893
Federal income tax expense (benefit) at statutory rate (35%)									(290)	(3,231)	313
Increases (reductions) in taxes resulting from-
State income taxes, net of federal tax benefit									(4)	(192)	17
AFUDC equity and other flow-through									(15)	(13)	(16)
Amortization of investment tax credits									(8)	(8)	(8)
Change in accounting method									0	0	(8)
ESOP dividend									(6)	(6)	(6)
Impairment of non-deductible goodwill									0	157	0
Remeasurement of deferred taxes									1,193	0	0
Uncertain tax positions									(3)	(16)	1
Valuation allowances									29	246	18
Other, net									(1)	8	4
Total provision for income taxes (benefits)	$ 413	$ 239	$ 117	$ 126	$ (3,389)	$ 251	$ (130)	$ 213	$ 895	$ (3,055)	$ 315
Effective income tax rate (percent)									(108.00%)	33.10%	35.30%
FES
Reconciliation of federal income tax expense at the federal statutory rate to the total provision for income taxes
Income (loss) before income taxes (benefits)									$ (2,096)	$ (8,443)	$ 147
Federal income tax expense (benefit) at statutory rate (35%)									(734)	(2,955)	51
Increases (reductions) in taxes resulting from-
State income taxes, net of federal tax benefit									(52)	(188)	2
Amortization of investment tax credits									(2)	(2)	(2)
ESOP dividend									0	(1)	(1)
Impairment of non-deductible goodwill									0	9	0
Remeasurement of deferred taxes									1,067	0	0
Uncertain tax positions									0	(8)	5
Valuation allowances									18	151	14
Other, net									(2)	6	(4)
Total provision for income taxes (benefits)	$ 281	$ 32	$ 23	$ (41)	$ (2,983)	$ 56	$ (143)	$ 82	$ 295	$ (2,988)	$ 65
Effective income tax rate (percent)									(14.10%)	35.40%	44.20%

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