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Operations and Segmentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Commodity Group Information [Line Items]
Freight revenues	$ 4,649	$ 4,880
Subsidiary revenue	177	214
Accessorial revenues	161	117
Other revenues	14	18
Total operating revenues	5,001	5,229
Cargo and Freight [Member]
Commodity Group Information [Line Items]
Freight revenues	4,649	4,880
Bulk [Member]
Commodity Group Information [Line Items]
Freight revenues	1,512	1,534
Industrial [Member]
Commodity Group Information [Line Items]
Freight revenues	1,656	1,894
Premium [Member]
Commodity Group Information [Line Items]
Freight revenues	1,481	1,452
Mexico [Member]
Commodity Group Information [Line Items]
Freight revenues	$ 565	$ 583

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