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Discontinued Operations - Major Classes of Cash Flow Items (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Income (loss) from discontinued operations	[1]	$ 2	$ (857)	$ (62)	$ 322
Depreciation and amortization, including regulatory assets, net, intangible assets and deferred debt-related costs				1,069	1,003
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions		(684)	(635)	(1,912)	(1,942)
Sales of investment securities held in trusts				506	736
Purchases of investment securities held in trusts				(536)	(780)
FES and FENOC | Discontinued Operations, Disposed of by Means Other than Sale
CASH FLOWS FROM OPERATING ACTIVITIES:
Income (loss) from discontinued operations		$ 2	$ (857)	(62)	322
Depreciation and amortization, including regulatory assets, net, intangible assets and deferred debt-related costs				0	110
CASH FLOWS FROM INVESTING ACTIVITIES:
Property additions				0	(27)
Sales of investment securities held in trusts				0	109
Purchases of investment securities held in trusts				$ 0	$ (122)
[1] Net of income tax expense (benefits) of $2 million and $(342) million for the three months ended September 30, 2019 and 2018, respectively, and $46 million and $(1.2) billion for the nine months ended September 30, 2019 and 2018, respectively.

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