Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 5,087	$ 5,946	$ 5,990
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	41	(171)	255
Change in accumulated other comprehensive income (loss) of equity method investees	(1)	12	0
Other comprehensive income (loss), net of tax	40	(159)	255
Total comprehensive income	$ 5,127	$ 5,787	$ 6,245