Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,449	$ 1,383	$ 4,129	$ 3,753
Other comprehensive income (loss):
Change in pension and retiree health and welfare benefits, net of tax	(5)	(4)	(17)	(12)
Change in accumulated other comprehensive income (loss) of equity method investees	0	0	1	1
Other comprehensive income (loss), net of tax	(5)	(4)	(16)	(11)
Total comprehensive income	$ 1,444	$ 1,379	$ 4,113	$ 3,742