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Unpaid losses and loss expenses Unpaid losses and loss expenses (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | $ (222) | $ (321) | $ (709) | $ (781) |  |
Liability for Claims and Claims Adjustment Expense | 75,992 | 72,631 | 75,992 | 72,631 | $ 72,943 | $ 67,811
Net loss and loss expenses paid, Prior Years |  |  | 9,217 | 7,922 |  |
Long Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 39 | (75) | (55) | (137) |  |
Short Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (261) | (246) | (654) | (644) |  |
Boy Scouts of America Agreement in Principle [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense | 600 |  | 600 |  | $ 800 |
Net loss and loss expenses paid, Prior Years | 200 |  |  |  |  |
North America Commercial P&C Insurance [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (166) | (157) | (561) | (440) |  |
North America Commercial P&C Insurance [Member] | Long Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (29) | (101) | (315) | (243) |  |
North America Commercial P&C Insurance [Member] | Short Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (137) | (56) | (246) | (197) |  |
North America Commercial P&C Insurance [Member] | Workers' Compensation Insurance [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (164) | (97) |  | (255) |  |
North America Commercial P&C Insurance [Member] | Auto Liability [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 58 |  |  | 74 |  |
North America Commercial P&C Insurance [Member] | Commercial Excess and Umbrella [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 71 |  |  | 74 |  |
North America Commercial P&C Insurance [Member] | Multi-Line |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (66) |  |  |  |  |
North America Commercial P&C Insurance [Member] | Property and Inland Marine [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (132) |  |  |  |  |
North America Agricultural Insurance [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 9 | 7 | (17) | 5 |  |
North America Agricultural Insurance [Member] | Long Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 0 | 0 | 0 | 0 |  |
North America Agricultural Insurance [Member] | Short Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 9 | 7 | (17) | 5 |  |
Corporate Segment [Member] | Long Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 73 | 43 | 272 | 140 |  |
Corporate Segment [Member] | Short Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 0 | 0 | 0 | 0 |  |
Corporate Segment [Member] | Other [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development |  |  | 155 | 68 |  |
Overseas General Insurance [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (5) | (28) | (238) | (209) |  |
Overseas General Insurance [Member] | Long Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (5) | (13) | (5) | (8) |  |
Overseas General Insurance [Member] | Short Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 0 | (15) | (233) | (201) |  |
Overseas General Insurance [Member] | Accident and Health Insurance Product Line [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development |  |  | (75) |  |  |
Overseas General Insurance [Member] | Property, Liability and Casualty Insurance Product Line |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development |  |  | (67) | (21) |  |
Overseas General Insurance [Member] | Financial [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 114 |  |  |  |  |
Overseas General Insurance [Member] | Personal Lines |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development |  |  | (53) |  |  |
Overseas General Insurance [Member] | Environmental lines [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development |  |  | (34) |  |  |
Overseas General Insurance [Member] | Casualty lines |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (82) |  |  |  |  |
North America Personal P&C Insurance [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (133) | (182) | (187) | (266) |  |
North America Personal P&C Insurance [Member] | Long Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 0 | 0 | 0 | 0 |  |
North America Personal P&C Insurance [Member] | Short Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | (133) | (182) | (187) | (266) |  |
Global Reinsurance [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 0 | (4) | 22 | (11) |  |
Global Reinsurance [Member] | Long Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | 0 | (4) | (7) | (26) |  |
Global Reinsurance [Member] | Short Tail [Member] |  |  |  |  |  |
Liability for Claims and Claims Adjustment Expense [Line Items] |  |  |  |  |  |
Net Prior Period Development | $ 0 | $ 0 | $ 29 | $ 15 |  |

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