Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,383	$ 1,221	$ 3,753	$ 3,732
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	(4)	(7)	(12)	(20)
Change in accumulated other comprehensive income (loss) of equity method investees	0	0	1	(1)
Other comprehensive income (loss), net of tax	(4)	(7)	(11)	(21)
Total comprehensive income	$ 1,379	$ 1,214	$ 3,742	$ 3,711