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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 2,971	$ 3,343	$ 9,083	$ 9,508
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,800	1,930	5,504	5,455
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	611	642	1,891	1,839
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	498	570	1,542	1,620
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	417	442	1,232	1,237
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	274	276	839	759
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	737	942	2,296	2,768
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 434	$ 471	$ 1,283	$ 1,285

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