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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 3,250	$ 2,799	$ 6,165	$ 5,438
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,853	1,680	3,525	3,288
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	624	578	1,197	1,117
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	552	494	1,050	953
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	420	402	795	772
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	257	206	483	446
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	972	801	1,826	1,520
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 425	$ 318	$ 814	$ 630

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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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