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Debt (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Jul. 01, 2023 | Dec. 31, 2022 | Mar. 31, 2000
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Repurchase agreements | $ 2,833.0 |  | $ 1,419.0 |
Huatai Group [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repurchase agreements |  | $ 1,269.0 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repurchase agreements | 1,009.0 |  | $ 0.0 |
Variable Interest Entity, Primary Beneficiary | Huatai Group [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repurchase agreements | 1,000.0 |  |  |
Huatai Group [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repurchase agreements |  | $ 1,300.0 |  |
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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