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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans
$ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
portfolioSegment
Dec. 31, 2023
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 132 $ 122
Number of investment portfolio segments | portfolioSegment 3  
Financing receivables in nonaccrual status with no allowance for credit losses $ 3 0
Financing receivables in nonaccrual status, investment income $ 6 2
Financing Receivable, Troubled Debt Restructuring   $ 0
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%
Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing receivables purchased from third parties $ 1,000 $ 311
Financing Receivable, Troubled Debt Restructuring 0  
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Troubled Debt Restructuring $ 386  
Mortgage loans, percent of total carrying value 2.00%  
Agricultural    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Troubled Debt Restructuring $ 0