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Railway Operating Revenues (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue from contract with customer	$ 2,573	$ 2,506	$ 2,085	$ 2,625	$ 2,690	$ 2,841	$ 2,925	$ 2,840	$ 9,789	$ 11,296	$ 11,458
Merchandise
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									6,088	6,803	6,744
Merchandise | Agricultural, Forest and Consumer
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									2,116	2,256	2,188
Merchandise | Chemicals
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									1,809	2,092	2,083
Merchandise | Metals/construction
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									1,333	1,461	1,482
Merchandise | Automotive
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									830	994	991
Intermodal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									2,654	2,824	2,893
Coal
Disaggregation of Revenue [Line Items]
Revenue from contract with customer									$ 1,047	$ 1,669	$ 1,821

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