Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 5,946	$ 5,990	$ 5,161
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	(171)	255	(48)
Change in accumulated other comprehensive income (loss) of equity method investees	12	0	1
Other comprehensive income (loss), net of tax	(159)	255	(47)
Total comprehensive income	$ 5,787	$ 6,245	$ 5,114