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Investments - Investments - Accrued Interest Receivable on Fixed Maturities, AFS and Mortgage Loans (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Securities [Member]    
Schedule of Investments [Line Items]    
Interest Receivable $ 438 $ 412
Mortgages [Member]    
Schedule of Investments [Line Items]    
Interest Receivable $ 24 $ 22