Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 23,282	$ 20,869	$ 23,515
Non-rail logistics subsidiary	769	688	770
Accessorial and other	639	403	417
Total other revenues	1,408	1,091	1,187
Net receivables from contract with customers	1,100	1,000
Remaining performance obligations	274	204
Consumer Products
Disaggregation of Revenue [Line Items]
Revenues	8,256	7,262	7,860
Industrial Products
Disaggregation of Revenue [Line Items]
Revenues	5,291	5,039	6,068
Agricultural Products
Disaggregation of Revenue [Line Items]
Revenues	5,100	4,822	4,685
Coal
Disaggregation of Revenue [Line Items]
Revenues	3,227	2,655	3,715
Total freight revenues
Disaggregation of Revenue [Line Items]
Revenues	$ 21,874	$ 19,778	$ 22,328