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Casualty, Environmental and Other Reserves - Balance Sheet Presentation (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Contingencies [Line Items] |  |  |  |
Current | $ 144 | $ 144 |  |
Long-term | 296 | 292 |  |
Total | 440 | 436 | $ 368 | $ 314
Casualty |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 52 | 50 |  |
Long-term | 143 | 144 |  |
Total | 195 | 194 | 180 | 196
Personal Injury |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 45 | 40 |  |
Long-term | 83 | 86 |  |
Total | 128 | 126 |  |
Occupational |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 7 | 10 |  |
Long-term | 60 | 58 |  |
Total | 67 | 68 |  |
Environmental |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 41 | 53 |  |
Long-term | 113 | 108 |  |
Total | 154 | 161 | 108 | 76
Other |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 51 | 41 |  |
Long-term | 40 | 40 |  |
Total | $ 91 | $ 81 | $ 80 | $ 42

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