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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivables purchased from third parties $ 32 $ 840  
Accrued interest receivable 108   $ 115
Financing receivables in nonaccrual status with no allowance for credit losses $ 2    
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%
Maximum      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing receivables in nonaccrual status, investment income $ 1 $ 1