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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 2,639	$ 2,625
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,608	1,672
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	539	551
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	459	520
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	370	367
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	240	234
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	719	655
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 312	$ 298

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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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