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Claim and Claim Adjustment Expense Reserves and Future Policy Benefit Reserves - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Loss from catastrophes, net of reinsurance | $ 114 | $ 178 | $ 171 | $ 357
Decrease in provision for insured events of prior years |  |  | (144) | (130)
Commercial Property and Casualty Operations |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Decrease in provision for insured events of prior years | (17) | (10) | (66) | (36)
Other insurance operations |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Decrease in provision for insured events of prior years |  |  | 64 | $ 40
Hurricane |  |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |  |
Catastrophe losses, net of reinsurance | $ 87 | $ 114 | $ 87 |

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