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Accumulated Other Comprehensive Income - Components of AOCI (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 6,814	$ 3,925	$ 6,241
Other comprehensive income before reclassifications	(2)	(106)	74
Amounts reclassified from AOCI	(27)	(67)	(127)
Deconsolidation of FES and FENOC		5
Other comprehensive income (loss)	(29)	(168)	(53)
Income tax benefits on other comprehensive loss	(8)	(67)	(21)
Other comprehensive loss, net of tax	(21)	(101)	(32)
Ending Balance	6,975	6,814	3,925
Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	41	142	174
Other comprehensive loss, net of tax	(21)	(101)	(32)
Ending Balance	20	41	142
Gains & Losses on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(11)	(22)	(28)
Other comprehensive income before reclassifications	0	0	0
Amounts reclassified from AOCI	2	8	10
Deconsolidation of FES and FENOC		13
Other comprehensive income (loss)	2	21	10
Income tax benefits on other comprehensive loss	0	10	4
Other comprehensive loss, net of tax	2	11	6
Ending Balance	(9)	(11)	(22)
Unrealized Gains on AFS Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	0	67	52
Other comprehensive income before reclassifications	0	(97)	85
Amounts reclassified from AOCI	0	(1)	(63)
Deconsolidation of FES and FENOC		(8)
Other comprehensive income (loss)	0	(106)	22
Income tax benefits on other comprehensive loss	0	(39)	7
Other comprehensive loss, net of tax	0	(67)	15
Ending Balance	0	0	67
Defined Benefit Pension & OPEB Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	52	97	150
Other comprehensive income before reclassifications	(2)	(9)	(11)
Amounts reclassified from AOCI	(29)	(74)	(74)
Deconsolidation of FES and FENOC		0
Other comprehensive income (loss)	(31)	(83)	(85)
Income tax benefits on other comprehensive loss	(8)	(38)	(32)
Other comprehensive loss, net of tax	(23)	(45)	(53)
Ending Balance	$ 29	$ 52	$ 97

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The amount of the reduction or elimination during the period of a noncontrolling interest resulting from the parent's loss of control and deconsolidation of the entity in which one or more outside parties had a noncontrolling interest.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount before tax, after reclassification adjustments of other comprehensive income (loss).

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