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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Total	$ 3,051	$ 2,971	$ 9,099	$ 9,083
Merchandise
Disaggregation of Revenue [Line Items]
Total	1,861	1,800	5,628	5,504
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Total	624	611	1,875	1,891
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Total	543	498	1,602	1,542
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Total	420	417	1,290	1,232
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Total	274	274	861	839
Intermodal
Disaggregation of Revenue [Line Items]
Total	763	737	2,250	2,296
Coal
Disaggregation of Revenue [Line Items]
Total	$ 427	$ 434	$ 1,221	$ 1,283

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