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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	$ 86	$ 175	$ 142	$ 174
Other comprehensive income before reclassifications		4	(97)	36
Amounts reclassified from AOCI	(17)	(23)	(34)	(54)
Deconsolidation of FES and FENOC			5
Other comprehensive loss	(17)	(19)	(126)	(18)
Income taxes (benefits) on other comprehensive income (loss)	(4)	(7)	(57)	(7)
Other comprehensive loss, net of tax	(13)	(12)	(69)	(11)
AOCI Ending Balance	73	163	73	163
Gains & Losses on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	(15)	(26)	(22)	(28)
Other comprehensive income before reclassifications		0	0	0
Amounts reclassified from AOCI	2	1	4	4
Deconsolidation of FES and FENOC			13
Other comprehensive loss	2	1	17	4
Income taxes (benefits) on other comprehensive income (loss)	1	1	9	2
Other comprehensive loss, net of tax	1	0	8	2
AOCI Ending Balance	(14)	(26)	(14)	(26)
Unrealized Gains on AFS Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	0	63	67	52
Other comprehensive income before reclassifications		4	(97)	36
Amounts reclassified from AOCI	0	(6)	(1)	(22)
Deconsolidation of FES and FENOC			(8)
Other comprehensive loss	0	(2)	(106)	14
Income taxes (benefits) on other comprehensive income (loss)	0	0	(39)	5
Other comprehensive loss, net of tax	0	(2)	(67)	9
AOCI Ending Balance	0	61	0	61
Defined Benefit Pension & OPEB Plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
AOCI Beginning Balance	101	138	97	150
Other comprehensive income before reclassifications		0	0	0
Amounts reclassified from AOCI	(19)	(18)	(37)	(36)
Deconsolidation of FES and FENOC			0
Other comprehensive loss	(19)	(18)	(37)	(36)
Income taxes (benefits) on other comprehensive income (loss)	(5)	(8)	(27)	(14)
Other comprehensive loss, net of tax	(14)	(10)	(10)	(22)
AOCI Ending Balance	$ 87	$ 128	$ 87	$ 128

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- Definition

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 before tax and 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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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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