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Investments - Restricted Investments (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Assets Held by Insurance Regulators $ 2,306 $ 2,339
Restricted Investments 3,447 3,488
Fair Value Measured at Net Asset Value Per Share [Member]    
Schedule of Investments [Line Items]    
Deposit Assets 65 75
Syndicate Policyholders [Member] | Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Restricted 935 890
Syndicate Policyholders [Member] | Short-term investments    
Schedule of Investments [Line Items]    
Restricted Investments, Current 30 30
Lloyd's of London [Member] | Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Restricted $ 111 $ 154