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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Corporate Joint Venture | Conrail |  |  |
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Rents, fees and services | $ 128 | $ 126 | $ 119
Purchase price amortization and other | 4 | 4 | 4
Equity earnings in affiliates | (44) | (49) | (42)
Total expense | 88 | 81 | 81
Affiliated Entity | TTX |  |  |
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Car hire rents | 221 | 219 | 223
Equity earnings in affiliates | (52) | (51) | (56)
Total expense | $ 169 | $ 168 | $ 167

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