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Properties - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) locomotive | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Property, Plant and Equipment [Line Items] |  |  |
Sale of natural resource assets | $ 88 |  |
Impairment assets to be disposed of |  | $ 49 |
Gains and losses on properties | (39) | (42) | $ (171)
Interest costs incurred on debt | 639 | 620 | 574
Interest costs capitalized | $ 14 | $ 16 | $ 17
Rail and other track material |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Number of locomotives held for sale | locomotive | 703 |  |
Gains and losses on properties | $ 385 |  |
Income tax benefit for locomotive retirement adjustment | $ (97) |  |

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