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Casualty, Environmental and Other Reserves - Narrative (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 USD ($) claim site | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Loss Contingencies [Line Items] |  |  |  |
Reserves | $ 440,000,000 | $ 436,000,000 | $ 368,000,000 | $ 314,000,000
Casualty Reserves |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reserves | 195,000,000 | 194,000,000 | 180,000,000 | 196,000,000
Self-insured retention amount per injury | $ 100,000,000 |  |  |
Individual claims expected to exceed self-insured retention amount | claim | 0 |  |  |
Environmental |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reserves | $ 154,000,000 | 161,000,000 | 108,000,000 | 76,000,000
Number of environmentally impaired sites | site | 230 |  |  |
Other |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Reserves | $ 91,000,000 | $ 81,000,000 | $ 80,000,000 | $ 42,000,000

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