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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 2,980	$ 3,250	$ 6,112	$ 6,165
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,826	1,853	3,704	3,525
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	627	624	1,280	1,197
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	503	552	1,044	1,050
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	415	420	815	795
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	281	257	565	483
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	745	972	1,559	1,826
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 409	$ 425	$ 849	$ 814

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