v3.26.1
Investments (Mortgage Loans by Credit Quality Indicator) (Details) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 11,477 $ 11,268  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 100.00% 100.00%  
Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 10,969 $ 10,821  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 95.60% 96.00%  
Financial Asset, Equal to or Greater than 90 Days Past Due      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 4   $ 6
Financial Asset, Equal to or Greater than 90 Days Past Due | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 0 $ 16  
Mortgage Loans By Credit Quality Indicator Range One [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 5,115 $ 5,040  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 46.60% 46.50%  
Mortgage Loans By Credit Quality Indicator Range Two [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 3,466 $ 3,331  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 31.60% 30.80%  
Mortgage Loans By Credit Quality Indicator Range Three [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 1,450 $ 1,457  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 13.20% 13.50%  
Mortgage Loans By Credit Quality Indicator Range Four [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 938 $ 993  
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total 8.60% 9.20%  
Debt Service Coverage Ratio Range One [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 9,726 $ 9,652  
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 4,787 4,799  
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 3,143 3,084  
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 1,159 1,126  
Debt Service Coverage Ratio Range One [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 637 643  
Debt Service Coverage Ratio Range Two [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 908 798  
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 253 162  
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 266 168  
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 215 232  
Debt Service Coverage Ratio Range Two [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 174 236  
Debt Service Coverage Ratio Range Three [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 335 371  
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range One [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 75 79  
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Two [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 57 79  
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Three [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss 76 99  
Debt Service Coverage Ratio Range Three [Member] | Mortgage Loans By Credit Quality Indicator Range Four [Member] | Commercial Real Estate      
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]      
Financing Receivable, before Allowance for Credit Loss $ 127 $ 114