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Investments - Amortized Cost of Mortgage Loans on Real Estate on Nonaccrual Status (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual $ 218 $ 153
Commercial    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual 49 5
Residential    
Financing Receivable, Nonaccrual [Line Items]    
Financing Receivable, Nonaccrual $ 169 $ 148