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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, after Allowance for Credit Loss $ 6,619   $ 6,396      
Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 6,668   $ 6,440      
Percent of Total 100.00%   100.00%      
Financing Receivable, Allowance for Credit Loss $ (49) $ (43) $ (44) $ (44) $ (48) $ (51)
Financing Receivable, after Allowance for Credit Loss 6,619   6,396      
Commercial Loan [Member] | Industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 3,044   $ 2,737      
Percent of Total 45.70%   42.50%      
Commercial Loan [Member] | Multifamily            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 2,175   $ 2,161      
Percent of Total 32.60%   33.50%      
Commercial Loan [Member] | Office            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 402   $ 507      
Percent of Total 6.00%   7.90%      
Commercial Loan [Member] | Retail            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 968   $ 957      
Percent of Total 14.50%   14.90%      
Commercial Loan [Member] | Residential Real Estate [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 79   $ 78      
Percent of Total 1.20%   1.20%      
Commercial Loan [Member] | Regional Shopping Malls            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 0   $ 0      
East North Central [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 384   $ 362      
Percent of Total 5.80%   5.60%      
Middle Atlantic [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 276   $ 259      
Percent of Total 4.10%   4.00%      
Mountain [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 841   $ 764      
Percent of Total 12.60%   11.90%      
New England [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 352   $ 356      
Percent of Total 5.30%   5.50%      
Pacific [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 1,372   $ 1,400      
Percent of Total 20.60%   21.80%      
South Atlantic [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 1,940   $ 1,821      
Percent of Total 29.10%   28.30%      
West North Central [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 145   $ 97      
Percent of Total 2.20%   1.50%      
West South Central [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 690   $ 588      
Percent of Total 10.30%   9.10%      
Region Others [Member] | Commercial Loan [Member]            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Financing Receivable, before Allowance for Credit Loss $ 668   $ 793      
Percent of Total 10.00%   12.30%