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Debt (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Mar. 31, 2000
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Senior Notes | INA Senior Notes Due December 2051 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 600.0 |
Long-term debt stated interest rate | 2.85% |
Senior Notes | INA Senior Notes Due December 2061 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 1,000.0 |
Long-term debt stated interest rate | 3.05% |
Trust Preferred Securities | Chubb INA Capital Securities Due 2030 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 309.0 | $ 300.0
ACE Capital Trust II common securities purchased |  | $ 9.2
Long-term debt stated interest rate | 9.70% | 9.70%
Unsecured Debt | INA Senior Notes Due August 2029 [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 100.0 |
Long-term debt stated interest rate | 8.875% |

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