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Investment in Affiliates and Related-Party Transactions - Schedule of Related Party in the Consolidated Income Statement Components (Details) - Materials, Supplies and Other - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Corporate Joint Venture | Conrail |  |  |
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Rents, fees and services | $ 126 | $ 119 | $ 117
Purchase price amortization and other | 4 | 4 | 4
Equity earnings in affiliates | (49) | (42) | (43)
Total expense | 81 | 81 | 78
Affiliated Entity | TTX |  |  |
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Car hire rents | 219 | 223 | 223
Equity earnings in affiliates | (51) | (56) | (60)
Total expense | $ 168 | $ 167 | $ 163

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