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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
portfolioSegment
Jun. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable $ 130   $ 130   $ 132
Number of investment portfolio segments | portfolioSegment     3    
Financing receivables in nonaccrual status with no allowance for credit losses $ 9   $ 9   $ 3
Financing receivables in nonaccrual status, investment income     $ 1 $ 3  
Minimum | Performing          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivable, before allowance for credit losses by performance status as a percentage of financing receivables, before allowance for credit losses 99.00%   99.00%   99.00%
Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables purchased from third parties $ 379 $ 188 $ 557 $ 349