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Business Segments and Related Information - Schedule of Total Segment Gross Operating Margin to Income Before Income Taxes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting [Abstract]      
Total segment gross operating margin $ 10,054 $ 10,018 $ 9,376
Adjustments to reconcile total segment gross operating margin to income before income taxes (addition or subtraction indicated by sign):      
Depreciation, amortization and accretion expense in operating costs and expenses (2,477) (2,343) (2,215)
Asset impairment charges in operating costs and expenses (50) (57) (30)
Net gains (losses) attributable to asset sales and related matters in operating costs and expenses 14 (2) 10
General and administrative costs (251) (244) (231)
Non-refundable payments received from shippers attributable to make-up rights (55) (75) (52)
Subsequent recognition of revenues attributable to make-up rights 31 41 71
Total other expense, net (1,367) (1,303) (1,228)
Income before income taxes $ 5,899 $ 6,035 $ 5,701