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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 3,044	$ 2,980	$ 6,048	$ 6,112
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,904	1,826	3,767	3,704
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	622	627	1,251	1,280
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	532	503	1,059	1,044
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	440	415	870	815
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	310	281	587	565
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	742	745	1,487	1,559
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 398	$ 409	$ 794	$ 849

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