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Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details)
$ in Millions
Sep. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investments [Line Items]            
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan 50.00%          
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan 59.00%          
Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 5,967   $ 5,412      
Avg. Debt-Service Coverage Ratio 2.60   2.48      
Financing Receivable, Allowance for Credit Loss $ 36 $ 36 $ 29 $ 26 $ 24 $ 38
Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.58   1.61      
Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.66   2.55      
Amortized Cost [Member] | Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Mortgage loans originated in current year $ 719   $ 1,488      
Mortgage loans originated in year before latest fiscal year 1,496   695      
Mortgage loans originated two years before latest fiscal year 703   813      
Mortgage loans originated three years before latest fiscal year 781   572      
Mortgage loans originated four years before latest fiscal year 546   462      
Mortgage loans originated five or more years before latest fiscal year 1,722   1,382      
Financing Receivable, before Allowance for Credit Loss 5,967   5,412      
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Mortgage loans originated in current year 16   7      
Mortgage loans originated in year before latest fiscal year 0   50      
Mortgage loans originated two years before latest fiscal year 22   91      
Mortgage loans originated three years before latest fiscal year 70   100      
Mortgage loans originated four years before latest fiscal year 108   45      
Mortgage loans originated five or more years before latest fiscal year 89   97      
Financing Receivable, before Allowance for Credit Loss 305   390      
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Mortgage loans originated in current year 703   1,481      
Mortgage loans originated in year before latest fiscal year 1,496   645      
Mortgage loans originated two years before latest fiscal year 681   722      
Mortgage loans originated three years before latest fiscal year 711   472      
Mortgage loans originated four years before latest fiscal year 438   417      
Mortgage loans originated five or more years before latest fiscal year 1,633   1,285      
Financing Receivable, before Allowance for Credit Loss $ 5,662   $ 5,022      
Originated in Current Fiscal Year | Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.59   2.70      
Originated in Current Fiscal Year | Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.02   2.37      
Originated in Current Fiscal Year | Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.61   2.70      
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.85   2.77      
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0   2.63      
Originated in Fiscal Year Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.85   2.78      
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.91   2.64      
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.66   1.57      
Originated Two Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.92   2.78      
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.73   2.02      
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.36   1.00      
Originated Three Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.87   2.23      
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.02   1.86      
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.11   1.37      
Originated Four Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.24   1.91      
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.39   2.41      
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.00   1.80      
Originated Five or More Years Before Latest Fiscal Year | Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.41   2.45