Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 1,377	$ 1,214
Other comprehensive income (loss):
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	(5)	(5)
Total comprehensive income	$ 1,372	$ 1,209