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Investments - Mortgage Loans by Region and Property Type (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, after Allowance for Credit Loss $ 6,396 $ 6,087    
Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 6,440 $ 6,138    
Percent of Total 100.00% 100.00%    
Financing Receivable, Allowance for Credit Loss $ 44 $ 51 $ 36 $ 29
Financing Receivable, after Allowance for Credit Loss 6,396 6,087    
Commercial Loan [Member] | Industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 2,737 $ 2,363    
Percent of Total 42.50% 38.50%    
Commercial Loan [Member] | Multifamily        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 2,161 $ 2,200    
Percent of Total 33.50% 35.90%    
Commercial Loan [Member] | Office        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 507 $ 578    
Percent of Total 7.90% 9.40%    
Commercial Loan [Member] | Retail        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 957 $ 917    
Percent of Total 14.90% 14.90%    
Commercial Loan [Member] | Residential Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 78 $ 80    
Percent of Total 1.20% 1.30%    
Commercial Loan [Member] | Regional Shopping Malls        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 0 $ 0    
Commercial Loan [Member] | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 100.00% 100.00%    
Commercial Loan [Member] | East North Central        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 362 $ 368    
Commercial Loan [Member] | East North Central | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 5.60% 6.00%    
Commercial Loan [Member] | Middle Atlantic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 259 $ 238    
Commercial Loan [Member] | Middle Atlantic | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 4.00% 3.90%    
Commercial Loan [Member] | Mountain        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 764 $ 699    
Commercial Loan [Member] | Mountain | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 11.90% 11.40%    
Commercial Loan [Member] | New England        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 356 $ 351    
Commercial Loan [Member] | New England | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 5.50% 5.70%    
Commercial Loan [Member] | Pacific        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 1,400 $ 1,326    
Commercial Loan [Member] | Pacific | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 21.80% 21.60%    
Commercial Loan [Member] | South Atlantic        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 1,821 $ 1,776    
Commercial Loan [Member] | South Atlantic | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 28.30% 28.90%    
Commercial Loan [Member] | West North Central        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 97 $ 103    
Commercial Loan [Member] | West North Central | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 1.50% 1.70%    
Commercial Loan [Member] | West South Central        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 588 $ 445    
Commercial Loan [Member] | West South Central | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 9.10% 7.20%    
Commercial Loan [Member] | Other        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 793 $ 832    
Commercial Loan [Member] | Other | Mortgage loans        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Percent of Total 12.30% 13.60%