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Casualty, Environmental and Other Reserves - Schedule of Claims Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 436 | $ 368 | $ 314
Charged to Expense | 165 | 143 | 130
Payments | (161) | (130) | (138)
Balance end of period | 440 | 436 | 368
Quality Carriers, Inc. |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Assumed in Acquisition |  |  | 62
Pan-Am |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Assumed in Acquisition |  | 55 |
Casualty Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 194 | 180 | 196
Charged to Expense | 69 | 45 | 55
Payments | (68) | (50) | (71)
Balance end of period | 195 | 194 | 180
Casualty Reserves | Quality Carriers, Inc. |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Assumed in Acquisition |  |  | 0
Casualty Reserves | Pan-Am |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Assumed in Acquisition |  | 19 |
Environmental Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 161 | 108 | 76
Charged to Expense | 29 | 47 | 26
Payments | (36) | (30) | (23)
Balance end of period | 154 | 161 | 108
Environmental Reserves | Quality Carriers, Inc. |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Assumed in Acquisition |  |  | 29
Environmental Reserves | Pan-Am |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Assumed in Acquisition |  | 36 |
Other Reserves |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | 81 | 80 | 42
Charged to Expense | 67 | 51 | 49
Payments | (57) | (50) | (44)
Balance end of period | $ 91 | 81 | 80
Other Reserves | Quality Carriers, Inc. |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Assumed in Acquisition |  |  | $ 33
Other Reserves | Pan-Am |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Assumed in Acquisition |  | $ 0 |

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