Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 5,476	$ 5,031	$ 5,087
Other comprehensive income:
Change in pension and retiree health and welfare benefits, net of tax	(83)	346	41
Change in accumulated other comprehensive income (loss) of equity method investees	0	1	(1)
Other comprehensive income (loss), net of tax	(83)	347	40
Total comprehensive income	$ 5,393	$ 5,378	$ 5,127