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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Corporate Joint Venture | Conrail |  |  |
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Rents, Fees and Services | $ 130 | $ 128 | $ 126
Purchase Price Amortization and Other | 4 | 4 | 4
Equity earnings in affiliates | (44) | (44) | (49)
Total expense | 90 | 88 | 81
Affiliated Entity | TTX |  |  |
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Equity earnings in affiliates | (51) | (52) | (51)
Car Hire Rents | 241 | 221 | 219
Total expense | $ 190 | $ 169 | $ 168

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