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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	$ 3,925	$ 6,241	$ 12,421
Other comprehensive income (loss)	(168)	(53)	4
Income taxes (benefits) on other comprehensive income (loss)	(67)	(21)	1
Other comprehensive income (loss), net of tax	(101)	(32)	3
Ending Balance	6,814	3,925	6,241
Accumulated Other Comprehensive Income
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	142	174	171
Other comprehensive income before reclassifications	(106)	74	119
Amounts reclassified from AOCI	(67)	(127)	(115)
Deconsolidation of FES and FENOC	5
Other comprehensive income (loss)	(168)	(53)	4
Income taxes (benefits) on other comprehensive income (loss)	(67)	(21)	1
Other comprehensive income (loss), net of tax	(101)	(32)	3
Ending Balance	41	142	174
Gains & Losses on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	(22)	(28)	(33)
Other comprehensive income before reclassifications	0	0	0
Amounts reclassified from AOCI	8	10	8
Deconsolidation of FES and FENOC	13
Other comprehensive income (loss)	21	10	8
Income taxes (benefits) on other comprehensive income (loss)	10	4	3
Other comprehensive income (loss), net of tax	11	6	5
Ending Balance	(11)	(22)	(28)
Unrealized Gains on AFS Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	67	52	18
Other comprehensive income before reclassifications	(97)	85	106
Amounts reclassified from AOCI	(1)	(63)	(51)
Deconsolidation of FES and FENOC	(8)
Other comprehensive income (loss)	(106)	22	55
Income taxes (benefits) on other comprehensive income (loss)	(39)	7	21
Other comprehensive income (loss), net of tax	(67)	15	34
Ending Balance	0	67	52
Defined Benefit Pension & OPEB Plans
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning Balance	97	150	186
Other comprehensive income before reclassifications	(9)	(11)	13
Amounts reclassified from AOCI	(74)	(74)	(72)
Deconsolidation of FES and FENOC	0
Other comprehensive income (loss)	(83)	(85)	(59)
Income taxes (benefits) on other comprehensive income (loss)	(38)	(32)	(23)
Other comprehensive income (loss), net of tax	(45)	(53)	(36)
Ending Balance	$ 52	$ 97	$ 150

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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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