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Investments - Restricted Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]    
Assets Held by Insurance Regulators $ 2,180 $ 2,189
Restricted Investments 3,238 3,138
Fair Value Measured at Net Asset Value Per Share [Member]    
Schedule of Investments [Line Items]    
Deposit Assets 65 62
Syndicate Policyholders [Member] | Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Restricted 819 718
Syndicate Policyholders [Member] | Short-term investments    
Schedule of Investments [Line Items]    
Restricted Investments, Current 20 8
Lloyd's of London [Member] | Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Restricted $ 154 $ 161