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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 2,852	$ 2,506	$ 8,290	$ 7,216
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,710	1,556	4,998	4,535
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	564	521	1,681	1,570
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	504	428	1,457	1,371
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	424	337	1,196	997
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	218	270	664	597
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	812	700	2,332	1,924
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 330	$ 250	$ 960	$ 757

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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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