Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,247	$ 1,371
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	(6)	1
Change in accumulated other comprehensive income (loss) of equity method investees	(1)	4
Other comprehensive income (loss), net of tax	(7)	5
Total comprehensive income	$ 1,240	$ 1,376