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Investments - Changes in Allowance for Credit Losses on Mortgage Loans on Real Estate (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-period     $ 152  
Additions (reductions) from provision for credit loss expense $ 7 $ 47 16 $ 65
Balance as of end-of-period 165   165  
Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-period     99  
Balance as of end-of-period 97   97  
Residential        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-period     53  
Balance as of end-of-period 68   68  
Mortgage loans on real estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-period 162 132 152 114
Additions (reductions) from provision for credit loss expense 6 47 16 65
Additions from purchases of PCD mortgage loans on real estate 0 0 0 0
Reductions for mortgage loans on real estate charged off (3) (10) (3) (10)
Balance as of end-of-period 165 169 165 169
Credit loss (expense) reversal (1) 1 1 1
Accrued investment income excluded from credit losses 109 88 109 88
Mortgage loans on real estate | Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-period 97 92 99 86
Additions (reductions) from provision for credit loss expense 3 40 1 46
Additions from purchases of PCD mortgage loans on real estate 0 0 0 0
Reductions for mortgage loans on real estate charged off (3) (10) (3) (10)
Balance as of end-of-period 97 122 97 122
Mortgage loans on real estate | Residential        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-period 65 40 53 28
Additions (reductions) from provision for credit loss expense 3 7 15 19
Additions from purchases of PCD mortgage loans on real estate 0 0 0 0
Reductions for mortgage loans on real estate charged off 0 0 0 0
Balance as of end-of-period $ 68 $ 47 $ 68 $ 47