Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred income tax assets:
Regulatory liabilities	$ 1,323	$ 1,349
Federal, state and foreign carryforwards	812	820
AROs	283	304
Other	741	686
Total deferred income tax assets	3,159	3,159
Valuation allowances	(187)	(164)
Total deferred income tax assets, net	2,972	2,995
Deferred income tax liabilities:
Property-related items	(12,244)	(11,814)
Investments	(1,998)	(2,877)
Regulatory assets	(898)	(764)
Other	(510)	(478)
Total deferred income tax liabilities	(15,650)	(15,933)
Net deferred income tax liability	$ (12,678)	$ (12,938)