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Unpaid losses and loss expenses Unpaid losses and loss expenses (Details) (Supplementary PPD) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($)
North America Commercial P&C Insurance - Workers' Compensation [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | $ (223)
North America Commercial P&C Insurance - Workers' Compensation [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (98)
North America Commercial P&C Insurance - Workers' Compensation [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (125)
North America Commercial P&C Insurance - Liability [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (207)
North America Commercial P&C Insurance - Liability [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (86)
North America Commercial P&C Insurance - Liability [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (121)
North America Commercial P&C Insurance - Other Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | 21
North America Commercial P&C Insurance - Other Casualty [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (7)
North America Commercial P&C Insurance - Other Casualty [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | 28
North America Commercial P&C Insurance - Non-Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (280)
North America Commercial P&C Insurance - Non-Casualty [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (3)
North America Commercial P&C Insurance - Non-Casualty [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (277)
North America Personal P&C Insurance [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (295)
North America Personal P&C Insurance [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (2)
North America Personal P&C Insurance [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (293)
Overseas General Insurance - Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (98)
Overseas General Insurance - Casualty [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (76)
Overseas General Insurance - Casualty [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (22)
Overseas General Insurance - Non-Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (216)
Overseas General Insurance - Non-Casualty [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (6)
Overseas General Insurance - Non-Casualty [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (210)
Global Reinsurance - Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | (29)
Global Reinsurance - Casualty [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (27)
Global Reinsurance - Casualty [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (2)
Global Reinsurance - Non-Casualty [Member] |
Supplementary PPD [Line Items] |
Short-Duration PPD | 30
Global Reinsurance - Non-Casualty [Member] | prior to 2012 |
Supplementary PPD [Line Items] |
Short-Duration PPD | (4)
Global Reinsurance - Non-Casualty [Member] | 2012 - 2021 |
Supplementary PPD [Line Items] |
Short-Duration PPD | $ 34

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