Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,264	$ 1,664	$ 2,511	$ 3,035
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	(7)	1	(13)	2
Change in accumulated other comprehensive income (loss) of equity method investees	0	2	(1)	6
Other comprehensive income (loss), net of tax	(7)	3	(14)	8
Total comprehensive income	$ 1,257	$ 1,667	$ 2,497	$ 3,043