Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,221	$ 1,442	$ 3,732	$ 4,477
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	(7)	1	(20)	3
Change in accumulated other comprehensive income (loss) of equity method investees	0	5	(1)	11
Other comprehensive income (loss), net of tax	(7)	6	(21)	14
Total comprehensive income	$ 1,214	$ 1,448	$ 3,711	$ 4,491