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TAXES - Reconciliation of Federal Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
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	$ 1,559	$ 1,129	$ 1,117
Federal income tax expense at statutory rate (21%)	327	237	235
Increases (reductions) in taxes resulting from-
State income taxes, net of federal tax benefit	122	75	96
AFUDC equity and other flow-through	(29)	(38)	(36)
Amortization of investment tax credits	(4)	(14)	(5)
Federal tax credits claimed	(34)	0	0
Nondeductible DPA monetary penalty	52	0	0
Excess deferred tax amortization due to the Tax Act	(54)	(56)	(74)
TMI-2 reversal of tax regulatory liabilities	0	(40)	0
Uncertain tax positions	82	1	11
Valuation allowances	17	(49)	5
Other, net	5	12	3
Total income taxes	$ 320	$ 126	$ 213
Effective income tax rate (percent)	20.50%	11.20%	19.10%

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