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Operations and Segmentation (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Commodity Group Information [Line Items]
Freight revenues	$ 3,972	$ 5,236	$ 8,852	$ 10,246
Subsidiary revenue	150	219	364	442
Accessorial revenues	103	123	220	256
Other revenues	19	18	37	36
Total operating revenues	4,244	5,596	9,473	10,980
Cargo and Freight [Member]
Commodity Group Information [Line Items]
Freight revenues	3,972	5,236	8,852	10,246
Bulk [Member]
Commodity Group Information [Line Items]
Freight revenues	1,386	1,678	2,920	3,298
Industrial [Member]
Commodity Group Information [Line Items]
Freight revenues	1,500	1,937	3,394	3,776
Premium [Member]
Commodity Group Information [Line Items]
Freight revenues	1,086	1,621	2,538	3,172
Mexico [Member]
Commodity Group Information [Line Items]
Freight revenues	$ 389	$ 603	$ 972	$ 1,179

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