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Investments - Investments - Mortgage Loans by Region and Property Type (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, after Allowance for Credit Loss $ 6,356 $ 6,396    
Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 6,399 $ 6,440    
Percent of Total 100.00% 100.00%    
Financing Receivable, Allowance for Credit Loss $ (43) $ (44) $ (48) $ (51)
Financing Receivable, after Allowance for Credit Loss 6,356 6,396    
Commercial Loan [Member] | Industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 2,724 $ 2,737    
Percent of Total 42.60% 42.50%    
Commercial Loan [Member] | Multifamily        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 2,141 $ 2,161    
Percent of Total 33.40% 33.50%    
Commercial Loan [Member] | Office        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 503 $ 507    
Percent of Total 7.90% 7.90%    
Commercial Loan [Member] | Retail        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 953 $ 957    
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 $ 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 $ 364 $ 362    
Percent of Total 5.70% 5.60%    
Middle Atlantic [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 259 $ 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 $ 770 $ 764    
Percent of Total 12.00% 11.90%    
New England [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 381 $ 356    
Percent of Total 6.00% 5.50%    
Pacific [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 1,403 $ 1,400    
Percent of Total 21.90% 21.80%    
South Atlantic [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 1,775 $ 1,821    
Percent of Total 27.70% 28.30%    
West North Central [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 97 $ 97    
Percent of Total 1.50% 1.50%    
West South Central [Member] | Commercial Loan [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Financing Receivable, before Allowance for Credit Loss $ 662 $ 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 $ 688 $ 793    
Percent of Total 10.80% 12.30%