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TAXES - Reconciliation of Federal Income Tax Expense (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of federal income tax expense at the federal statutory rate to the total provision for income taxes
Income from Continuing Operations, before income taxes		$ 1,129	$ 1,117	$ 1,512
Federal income tax expense at statutory rate (21%)		237	235	318
Increases (reductions) in taxes resulting from-
State income taxes, net of federal tax benefit		75	96	90
AFUDC equity and other flow-through		(38)	(36)	(31)
Amortization of investment tax credits	$ (10)	(14)	(5)	(5)
Remeasurement of deferred taxes		0	0	24
WV unitary group remeasurement		0	0	126
Excess deferred tax amortization due to the Tax Act		(56)	(74)	(60)
TMI-2 reversal of tax regulatory liabilities		40	0	0
Uncertain tax positions		(1)	(11)	2
Valuation allowances		(49)	5	21
Other, net		12	3	5
Total income taxes		$ 126	$ 213	$ 490
Effective income tax rate (percent)		11.20%	19.10%	32.40%

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