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Investments (Mortgage Loans - Narrative) (Details) - Mortgage Loans - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Accrued interest receivable $ 128   $ 128   $ 122
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     $ 3 $ 1  
Residential          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing receivables purchased from third parties $ 314 $ 224 $ 664 $ 255