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v3.20.4

Nature Of Operations (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 USD ($) mi | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) segment mi | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Commodity Group Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other subsidiary revenues |  |  |  |  |  |  |  |  | $ 743 | $ 880 | $ 881
Accessorial revenues |  |  |  |  |  |  |  |  | 473 | 514 | 502
Other revenues |  |  |  |  |  |  |  |  | 66 | 71 | 65
Total operating revenues | $ 5,141 | $ 4,919 | $ 4,244 | $ 5,229 | $ 5,212 | $ 5,516 | $ 5,596 | $ 5,384 | $ 19,533 | 21,708 | 22,832
Network route miles | mi | 32,313 |  |  |  |  |  |  |  | 32,313 |  |
Route miles owned | mi | 26,069 |  |  |  |  |  |  |  | 26,069 |  |
Reportable segments | segment |  |  |  |  |  |  |  |  | 1 |  |
Cargo and Freight [Member] |  |  |  |  |  |  |  |  |  |  |
Commodity Group Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Freight revenues |  |  |  |  |  |  |  |  | $ 18,251 | 20,243 | 21,384
Bulk [Member] |  |  |  |  |  |  |  |  |  |  |
Commodity Group Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Freight revenues |  |  |  |  |  |  |  |  | 5,960 | 6,529 | 7,069
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |
Commodity Group Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Freight revenues |  |  |  |  |  |  |  |  | 6,622 | 7,472 | 7,689
Premium [Member] |  |  |  |  |  |  |  |  |  |  |
Commodity Group Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Freight revenues |  |  |  |  |  |  |  |  | 5,669 | 6,242 | 6,626
Mexico [Member] |  |  |  |  |  |  |  |  |  |  |
Commodity Group Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Freight revenues |  |  |  |  |  |  |  |  | $ 2,100 | $ 2,300 | $ 2,500

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