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TAXES - Accumulated Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated deferred income taxes
Property basis differences	$ 5,670	$ 5,396
Pension and OPEB	(570)	(769)
AROs	(21)	(28)
Regulatory asset/liability	322	440
Deferred compensation	(155)	(165)
Loss carryforwards and tax credits	(2,040)	(1,995)
Valuation reserve	484	496	$ 441	$ 394
All other	(253)	(280)
Net deferred income tax liability	$ 3,437	$ 3,095

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