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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 2,915	$ 2,639
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,672	1,608
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	573	539
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	498	459
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	375	370
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	226	240
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	854	719
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 389	$ 312

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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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