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Discontinued Operations - Major Classes of Cash Flow Items from Discontinued Operations (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Income (loss) from discontinued operations	[1]	$ 32	$ (45)	$ 1,224	$ (97)
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs				604	829
Unrealized (gain) loss on derivative transactions				(10)	53
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions		(724)	(666)	(1,307)	(1,254)
Nuclear fuel				0	(134)
Sales of investment securities held in trusts				475	1,257
Purchases of investment securities held in trusts				(508)	(1,305)
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale
CASH FLOWS FROM OPERATING ACTIVITIES:
Income (loss) from discontinued operations		$ 32	$ (45)	1,224	(97)
Depreciation and amortization, including nuclear fuel, regulatory assets, net, intangible assets and deferred debt-related costs				47	157
Unrealized (gain) loss on derivative transactions				(10)	53
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions				(15)	(178)
Nuclear fuel				0	(134)
Sales of investment securities held in trusts				109	437
Purchases of investment securities held in trusts				$ (122)	$ (466)
[1] Net of income tax benefits of $30 million and $15 million for the three months ended June 30, 2018 and 2017, respectively, and income tax benefits of $920 million and $41 million for the six months ended June 30, 2018 and 2017, respectively.

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