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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables purchased from third parties $ 0 $ 415 $ 32 $ 1,300  
Accrued interest receivable 114   114   $ 115
Financing receivables in nonaccrual status with no allowance for credit losses $ 0   $ 0   $ 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%   99.00%
Maximum          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables in nonaccrual status, investment income       $ 1