v3.26.3
Investments - Investments - Loan-to-Value and Debt Service Coverage Ratio by Origination Year (Details)
$ in Millions
Sep. 30, 2026
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]            
Current Weighted Average Loan to Value Ratio of Commercial Mortgage Loan 55.00%          
Original Weighted Average Loan to Value Ratio of Commercial Mortgage loan 58.00%          
Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.29   2.36      
Financing Receivable, before Allowance for Credit Loss $ 7,230   $ 6,886      
Financing Receivable, Allowance for Credit Loss $ 49 $ 49 $ 49 $ 49 $ 43 $ 44
Commercial Loan [Member] | Originated in Current Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.82   1.79      
Commercial Loan [Member] | Originated in Fiscal Year Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.76   1.50      
Commercial Loan [Member] | Originated Two Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.59   1.37      
Commercial Loan [Member] | Originated Three Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.39   2.77      
Commercial Loan [Member] | Originated Four Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.98   2.93      
Commercial Loan [Member] | Originated Five or More Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.67   2.56      
Commercial Loan [Member] | LTV Greater than 80 Percent            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0.85   1.38      
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated in Current Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0   1.83      
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated in Fiscal Year Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0   0      
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated Two Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0   0      
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated Three Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0   0      
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated Four Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0   0.98      
Commercial Loan [Member] | LTV Greater than 80 Percent | Originated Five or More Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0.85   1.39      
Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.25   2.14      
Commercial Loan [Member] | 65% - 80% | Originated in Current Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0   1.53      
Commercial Loan [Member] | 65% - 80% | Originated in Fiscal Year Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.04   1.03      
Commercial Loan [Member] | 65% - 80% | Originated Two Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.46   0.83      
Commercial Loan [Member] | 65% - 80% | Originated Three Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 0.78   1.65      
Commercial Loan [Member] | 65% - 80% | Originated Four Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.40   2.72      
Commercial Loan [Member] | 65% - 80% | Originated Five or More Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.46   1.96      
Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.33   2.44      
Commercial Loan [Member] | Less than 65% | Originated in Current Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.82   1.80      
Commercial Loan [Member] | Less than 65% | Originated in Fiscal Year Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.79   1.57      
Commercial Loan [Member] | Less than 65% | Originated Two Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.60   1.40      
Commercial Loan [Member] | Less than 65% | Originated Three Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 1.44   2.93      
Commercial Loan [Member] | Less than 65% | Originated Four Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 3.17   3.10      
Commercial Loan [Member] | Less than 65% | Originated Five or More Years Before Latest Fiscal Year            
Schedule of Investments [Line Items]            
Avg. Debt-Service Coverage Ratio 2.79   2.75      
Amortized Cost [Member] | Commercial Loan [Member]            
Schedule of Investments [Line Items]            
Mortgage loans originated in current year $ 837   $ 1,209      
Mortgage loans originated in year before latest fiscal year 1,247   611      
Mortgage loans originated two years before latest fiscal year 686   424      
Mortgage loans originated three years before latest fiscal year 265   740      
Mortgage loans originated four years before latest fiscal year 601   1,473      
Mortgage loans originated five or more years before latest fiscal year 3,594   2,429      
Financing Receivable, before Allowance for Credit Loss 7,230   6,886      
Amortized Cost [Member] | Commercial Loan [Member] | LTV Greater than 80 Percent            
Schedule of Investments [Line Items]            
Mortgage loans originated in current year 0   30      
Mortgage loans originated in year before latest fiscal year 0   0      
Mortgage loans originated two years before latest fiscal year 0   0      
Mortgage loans originated three years before latest fiscal year 0   0      
Mortgage loans originated four years before latest fiscal year 0   36      
Mortgage loans originated five or more years before latest fiscal year 125   164      
Financing Receivable, before Allowance for Credit Loss 125   230      
Amortized Cost [Member] | Commercial Loan [Member] | 65% - 80%            
Schedule of Investments [Line Items]            
Mortgage loans originated in current year 0   56      
Mortgage loans originated in year before latest fiscal year 39   76      
Mortgage loans originated two years before latest fiscal year 77   23      
Mortgage loans originated three years before latest fiscal year 22   95      
Mortgage loans originated four years before latest fiscal year 146   444      
Mortgage loans originated five or more years before latest fiscal year 558   315      
Financing Receivable, before Allowance for Credit Loss 842   1,009      
Amortized Cost [Member] | Commercial Loan [Member] | Less than 65%            
Schedule of Investments [Line Items]            
Mortgage loans originated in current year 837   1,123      
Mortgage loans originated in year before latest fiscal year 1,208   535      
Mortgage loans originated two years before latest fiscal year 609   401      
Mortgage loans originated three years before latest fiscal year 243   645      
Mortgage loans originated four years before latest fiscal year 455   993      
Mortgage loans originated five or more years before latest fiscal year 2,911   1,950      
Financing Receivable, before Allowance for Credit Loss $ 6,263   $ 5,647