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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-year     $ 152  
Additions (reductions) from provision for credit loss expense $ 7 $ 47 16 $ 65
Balance as of end-of-year 165   165  
Accrued interest receivable excluded from credit losses 110 89 110 89
Mortgage loans on real estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-year 162 133 152 114
Additions (reductions) from provision for credit loss expense 6 47 16 66
Additions from purchases of PCD mortgage loans on real estate 0 0 0 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (3) (10) (3) (10)
Balance as of end-of-year 165 170 165 170
Credit loss (expense) benefit (1) 1 1 1
Commercial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-year     99  
Balance as of end-of-year 97   97  
Commercial | Mortgage loans on real estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-year 97 93 99 86
Additions (reductions) from provision for credit loss expense 3 40 1 47
Additions from purchases of PCD mortgage loans on real estate 0 0 0 0
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff (3) (10) (3) (10)
Balance as of end-of-year 97 123 97 123
Residential        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-year     53  
Balance as of end-of-year 68   68  
Residential | Mortgage loans on real estate        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Balance as of beginning-of-year 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
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff 0 0 0 0
Balance as of end-of-year $ 68 $ 47 $ 68 $ 47