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Casualty, Environmental and Other Reserves - Schedule of Claims Activity (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Loss Contingency Accrual [Roll Forward] |  |  |
Balance at beginning of period | $ 368 | $ 314 | $ 305
Charged to Expense | 143 | 130 | 107
Payments | (130) | (138) | (98)
Balance end of period | 436 | 368 | 314
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 | 180 | 196 | 187
Charged to Expense | 45 | 55 | 55
Payments | (50) | (71) | (46)
Balance end of period | 194 | 180 | 196
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 | 108 | 76 | 74
Charged to Expense | 47 | 26 | 20
Payments | (30) | (23) | (18)
Balance end of period | 161 | 108 | 76
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 | 80 | 42 | 44
Charged to Expense | 51 | 49 | 32
Payments | (50) | (44) | (34)
Balance end of period | 81 | 80 | $ 42
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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