Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,664	$ 1,516	$ 3,035	$ 2,767
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	1	1	2	2
Change in accumulated other comprehensive income (loss) of equity method investees	2	0	6	0
Other comprehensive income (loss), net of tax	3	1	8	2
Total comprehensive income	$ 1,667	$ 1,517	$ 3,043	$ 2,769