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Investments - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) railroad | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Schedule of Investments [Line Items] |  |  |
Future payments for access fees due 2024 | $ 44 |  |
Future payments for access fees due 2025 | 44 |  |
Future payments for access fees due 2026 | 44 |  |
Future payments for access fees due 2027 | 44 |  |
Future payments for access fees due 2028 | 44 |  |
Future payments for access fees, thereafter | 17 |  |
Long-term advances from investee | $ 1,839 | $ 1,759 |
Number of railroads | railroad | 6 |  |
Purchased services and rents | $ 2,070 | $ 1,922 | $ 1,726
Conrail, Economic |  |  |
Schedule of Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 58.00% | 58.00% |
Conrail, Voting |  |  |
Schedule of Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 50.00% | 50.00% |
Conrail |  |  |
Schedule of Investments [Line Items] |  |  |
Difference between investment and share of underlying net equity | $ 480 |  |
Expenses from transactions with related party | 164 | $ 156 | 147
General and administrative support to Conrail, annual fees | 6 |  |
Due to Conrail for the operation of Shared Assets Areas | 198 | 173 |
Long-term advances from investee | $ 534 | 534 |
Long-term advances from investee, average interest rate | 1.31% |  |
Equity in earnings of investee | $ 70 | 58 | 56
TTX |  |  |
Schedule of Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 19.78% |  |
Equity in earnings of investee | $ 47 | 53 | 53
Purchased services and rents | $ 274 | $ 256 | $ 246

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