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Unpaid losses and loss expenses Unpaid losses and loss expenses (Supplementary PPD) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
North America Commercial P&C Insurance - Workers' Compensation [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | $ (437)
North America Commercial P&C Insurance - Workers' Compensation [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (132)
North America Commercial P&C Insurance - Workers' Compensation [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (305)
North America Commercial P&C Insurance - Liability [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | 243
North America Commercial P&C Insurance - Liability [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | 98
North America Commercial P&C Insurance - Liability [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | 145
North America Commercial P&C Insurance - Other Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | 133
North America Commercial P&C Insurance - Other Casualty [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | 56
North America Commercial P&C Insurance - Other Casualty [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | 77
North America Commercial P&C Insurance - Non-Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (330)
North America Commercial P&C Insurance - Non-Casualty [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (11)
North America Commercial P&C Insurance - Non-Casualty [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (319)
North America Personal P&C Insurance [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (128)
North America Personal P&C Insurance [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (5)
North America Personal P&C Insurance [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (123)
Overseas General Insurance - Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (68)
Overseas General Insurance - Casualty [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | 8
Overseas General Insurance - Casualty [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (76)
Overseas General Insurance - Non-Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (280)
Overseas General Insurance - Non-Casualty [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (10)
Overseas General Insurance - Non-Casualty [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (270)
Global Reinsurance - Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (8)
Global Reinsurance - Casualty [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (7)
Global Reinsurance - Casualty [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (1)
Global Reinsurance - Non-Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | 30
Global Reinsurance - Non-Casualty [Member] | Accident years prior to 2013 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (4)
Global Reinsurance - Non-Casualty [Member] | Accident years 2013 - 2022 |
Supplementary PPD [Line Items] |
Short-Duration PPD | $ 34

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