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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Loss Contingencies [Line Items] |  |  |
Current | $ 148 | $ 144 | [1]
Long-term | 299 | 296 | [1]
Total | 447 | 440 |
Total Casualty |  |  |
Loss Contingencies [Line Items] |  |  |
Current | 62 | 52 |
Long-term | 138 | 143 |
Total | 200 | 195 |
Personal Injury |  |  |
Loss Contingencies [Line Items] |  |  |
Current | 51 | 45 |
Long-term | 82 | 83 |
Total | 133 | 128 |
Occupational |  |  |
Loss Contingencies [Line Items] |  |  |
Current | 11 | 7 |
Long-term | 56 | 60 |
Total | 67 | 67 |
Environmental |  |  |
Loss Contingencies [Line Items] |  |  |
Current | 36 | 41 |
Long-term | 113 | 113 |
Total | 149 | 154 |
Other |  |  |
Loss Contingencies [Line Items] |  |  |
Current | 50 | 51 |
Long-term | 48 | 40 |
Total | $ 98 | $ 91 |
[1] | See Note 11, Revision of Prior Period Financial Statements.

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