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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Total	$ 3,103	$ 3,051	$ 9,206	$ 9,099
Merchandise
Disaggregation of Revenue [Line Items]
Total	1,969	1,861	5,804	5,628
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Total	630	624	1,911	1,875
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Total	569	543	1,650	1,602
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Total	448	420	1,320	1,290
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Total	322	274	923	861
Intermodal
Disaggregation of Revenue [Line Items]
Total	759	763	2,262	2,250
Coal
Disaggregation of Revenue [Line Items]
Total	$ 375	$ 427	$ 1,140	$ 1,221

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