Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,214	$ 1,143
Other comprehensive income (loss):
Change in pension and retiree health and welfare benefits, net of tax	(6)	(4)
Change in accumulated other comprehensive income (loss) of equity method investees	1	1
Other comprehensive income (loss), net of tax	(5)	(3)
Total comprehensive income	$ 1,209	$ 1,140