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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 3,343	$ 2,852	$ 9,508	$ 8,290
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,930	1,710	5,455	4,998
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	642	564	1,839	1,681
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	570	504	1,620	1,457
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	442	424	1,237	1,196
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	276	218	759	664
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	942	812	2,768	2,332
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 471	$ 330	$ 1,285	$ 960

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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