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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 12,156	$ 12,745	$ 11,142
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,353	7,331	6,669
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,530	2,493	2,251
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,054	2,148	1,951
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,634	1,652	1,562
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,135	1,038	905
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,090	3,681	3,163
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,713	$ 1,733	$ 1,310

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