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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 3,004	$ 3,132
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,863	1,878
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	629	653
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	527	541
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	430	400
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	277	284
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	745	814
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 396	$ 440

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