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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total	$ 3,110	$ 3,044	$ 6,103	$ 6,048
Merchandise
Disaggregation of Revenue [Line Items]
Total	1,972	1,904	3,835	3,767
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Total	645	622	1,281	1,251
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Total	546	532	1,081	1,059
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Total	458	440	872	870
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Total	323	310	601	587
Intermodal
Disaggregation of Revenue [Line Items]
Total	743	742	1,503	1,487
Coal
Disaggregation of Revenue [Line Items]
Total	$ 395	$ 398	$ 765	$ 794

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