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Railway Operating Revenues - Disaggregation of Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 12,745	$ 11,142	$ 9,789
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	7,331	6,669	6,088
Merchandise | Agriculture, forest and consumer products
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,493	2,251	2,116
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	2,148	1,951	1,809
Merchandise | Metals and construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,652	1,562	1,333
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	1,038	905	830
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	3,681	3,163	2,654
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 1,733	$ 1,310	$ 1,047

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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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