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Operations and Segmentation (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Commodity Group Information [Line Items]
Freight revenues	$ 4,880	$ 5,010
Subsidiary revenue	214	223
Accessorial revenues	117	133
Other revenues	18	18
Total operating revenues	5,229	5,384
Cargo and Freight [Member]
Commodity Group Information [Line Items]
Freight revenues	4,880	5,010
Bulk [Member]
Commodity Group Information [Line Items]
Freight revenues	1,534	1,620
Industrial [Member]
Commodity Group Information [Line Items]
Freight revenues	1,894	1,839
Premium [Member]
Commodity Group Information [Line Items]
Freight revenues	1,452	1,551
Mexico [Member]
Commodity Group Information [Line Items]
Freight revenues	$ 583	$ 576

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