Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,143	$ 1,247
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	(4)	(6)
Change in accumulated other comprehensive income (loss) of equity method investees	1	(1)
Other comprehensive income (loss), net of tax	(3)	(7)
Total comprehensive income	$ 1,140	$ 1,240