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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 2,799	$ 2,085	$ 5,438	$ 4,710
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,680	1,307	3,288	2,979
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	578	498	1,117	1,049
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	494	423	953	943
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	402	293	772	660
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	206	93	446	327
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	801	569	1,520	1,224
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 318	$ 209	$ 630	$ 507

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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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