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Casualty, Environmental and Other Reserves - Narrative (Details) |  | 9 Months Ended |
--- | --- | --- | ---
Jun. 01, 2021 USD ($) | Sep. 30, 2023 USD ($) claim site | Dec. 31, 2022 USD ($)
All Contingencies Reserves [Line Items] |  |  |
Total reserves |  | $ 435,000,000 | $ 436,000,000
Casualty |  |  |
All Contingencies Reserves [Line Items] |  |  |
Total reserves |  | 194,000,000 | 194,000,000
Self-insured retention amount, per occurrence | $ 100,000,000 | $ 100,000,000 |
Number of individual claims expected to exceed self insured retention amount | claim |  | 0 |
Environmental |  |  |
All Contingencies Reserves [Line Items] |  |  |
Total reserves |  | $ 157,000,000 | 161,000,000
Environmental impaired sites | site |  | 230 |
Other |  |  |
All Contingencies Reserves [Line Items] |  |  |
Total reserves |  | $ 84,000,000 | $ 81,000,000

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