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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 11,142	$ 9,789	$ 11,296
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	6,669	6,088	6,803
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,251	2,116	2,256
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,951	1,809	2,092
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,562	1,333	1,461
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	905	830	994
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,163	2,654	2,824
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,310	$ 1,047	$ 1,669

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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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