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Investments - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) railroad | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items] |  |  |
Number of railroads | railroad | 7 |  |
Impairment of investment | $ 0 | $ 0 | $ 99
Loss due to noncash impairment charges against equity method investment |  |  | 74
Shared Assets Areas CRC Lease |  |  |
Schedule of Investments [Line Items] |  |  |
Future payments for access fees due 2023 | 42 |  |
Future payments for access fees due 2024 | 42 |  |
Future payments for access fees due 2025 | 42 |  |
Future payments for access fees due 2026 | 42 |  |
Future payments for access fees due 2027 | 42 |  |
Future payments for access fees, thereafter | $ 62 |  |
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 | 156 | $ 147 | 129
General and administrative support to Conrail | 6 |  |
Accounts payable converted into long-term advances from Conrail |  |  | 254
Due to Conrail, current | 173 | 112 |
Due to Conrail, noncurrent | $ 534 | 534 |
Due to affiliate, average interest rate | 1.31% |  |
Equity in earnings of investee | $ 58 | 56 | 58
TTX Company |  |  |
Schedule of Investments [Line Items] |  |  |
Equity method investment, ownership percentage | 19.78% |  |
Equity in earnings of investee | $ 53 | 53 | 48
TTX Company | Purchased Services and Rent |  |  |
Schedule of Investments [Line Items] |  |  |
Expenses from transactions with related party | $ 256 | $ 246 | $ 250

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