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Investment in Affiliates and Related-Party Transactions - Schedule of Related Party in the Consolidated Income Statement Components (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Total Expense | $ 9,096 | $ 8,830 | $ 6,928
Corporate Joint Venture | Conrail |  |  |
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Rents, Fees and Services | 132 | 130 | 128
Purchase Price Amortization and Other | 4 | 4 | 4
Equity Earnings in Affiliates | (54) | (44) | (44)
Total Expense | 82 | 90 | 88
Related Party | TTX |  |  |
Related Party Amounts Consolidated Income Statements [Abstract] |  |  |
Equity Earnings in Affiliates | (49) | (51) | (52)
Car Hire Rents | 249 | 241 | 221
Total Expense | $ 200 | $ 190 | $ 169

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