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Investments - Investments - Mortgage Loans- Valuation Allowance Activity (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
Jun. 30, 2021
USD ($)
Jun. 30, 2020
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Number of loans held-for-sale 0   0   0
Number of loans with modifications 0 0 0 0  
Commercial Loan [Member]          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Financing Receivable, Individually Evaluated for Impairment $ 0   $ 0