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Investments - Restricted Investments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Assets Held by Insurance Regulators $ 2,539 $ 2,362
Restricted Investments 3,785 3,504
Fair Value Measured at Net Asset Value Per Share [Member]    
Schedule of Investments [Line Items]    
Deposit Assets 80 61
Syndicate Policyholders [Member] | Debt Securities [Member]    
Schedule of Investments [Line Items]    
Debt Securities, Available-for-sale, Restricted 1,121 1,056
Syndicate Policyholders [Member] | Short-term investments    
Schedule of Investments [Line Items]    
Restricted Investments, Current $ 45 $ 25