Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,227	$ 1,264	$ 2,370	$ 2,511
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	(4)	(7)	(8)	(13)
Change in accumulated other comprehensive income (loss) of equity method investees	0	0	1	(1)
Other comprehensive income (loss), net of tax	(4)	(7)	(7)	(14)
Total comprehensive income	$ 1,223	$ 1,257	$ 2,363	$ 2,497