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Loss on Asset Disposal (Details)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
locomotive
Sep. 30, 2019
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on locomotives   $ 14 $ 4
Railroad Transportation Equipment      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Loss on locomotives $ (385)    
Tax benefit on loss from sale of locomotives $ 97    
Number of locomotives sold | locomotive   574  
Number of locomotives classified as Held-for-Sale | locomotive   703  
Assets Held-for-sale, Not Part of Disposal Group   $ 20