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Operations and Segmentation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Commodity Group Information [Line Items]
Freight revenues	$ 4,596	$ 5,146	$ 13,448	$ 15,392
Subsidiary revenue	193	223	557	665
Accessorial revenues	114	132	334	388
Other revenues	16	15	53	51
Total operating revenues	4,919	5,516	14,392	16,496
Cargo and Freight [Member]
Commodity Group Information [Line Items]
Freight revenues	4,596	5,146	13,448	15,392
Bulk [Member]
Commodity Group Information [Line Items]
Freight revenues	1,478	1,682	4,398	4,980
Industrial [Member]
Commodity Group Information [Line Items]
Freight revenues	1,567	1,902	4,961	5,678
Premium [Member]
Commodity Group Information [Line Items]
Freight revenues	1,551	1,562	4,089	4,734
Mexico [Member]
Commodity Group Information [Line Items]
Freight revenues	$ 556	$ 602	$ 1,500	$ 1,800

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