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Investments - Restricted Investments (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Assets Held by Insurance Regulators $ 2,370 $ 2,339
Restricted Investments 3,541 3,488
Fair Value Measured at Net Asset Value Per Share [Member]    
Schedule of Investments [Line Items]    
Deposit Assets 75 75
Syndicate Policyholders [Member] | Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Restricted 917 890
Syndicate Policyholders [Member] | Short-term investments    
Schedule of Investments [Line Items]    
Restricted Investments, Current 19 30
Lloyd's of London [Member] | Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Restricted $ 160 $ 154