Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 819	$ 819	$ 1,522	$ 1,492
Other comprehensive income, before tax:
Pension and other postretirement benefits	5	10	11	21
Other comprehensive income of equity investees	2	0	8	0
Other comprehensive income, before tax	7	10	19	21
Income tax expense related to items of other comprehensive income	(1)	(2)	(5)	(5)
Other comprehensive income, net of tax	6	8	14	16
Total comprehensive income	$ 825	$ 827	$ 1,536	$ 1,508