Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,442	$ 1,538	$ 4,477	$ 4,305
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	1	1	3	3
Change in accumulated other comprehensive income (loss) of equity method investees	5	0	11	0
Other comprehensive income (loss), net of tax	6	1	14	3
Total comprehensive income	$ 1,448	$ 1,539	$ 4,491	$ 4,308