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INVESTMENTS - Narrative (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
issue
Mar. 31, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
issue
Sep. 30, 2022
USD ($)
Dec. 31, 2027
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
issue
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Net Investment Income [Line Items]                    
Accrued interest written off     $ 0   $ 0          
Number of unrealized loss positions | issue 4,902     4,902       4,798    
Debt securities exposure in single issuer greater than stated percentage of total investments 1.10%     1.10%            
Amortized cost of fixed maturities available-for-sale $ 63,853,000,000     $ 63,853,000,000       $ 68,087,000,000    
12 months or longer, gross unrealized losses 9,896,000,000     9,896,000,000       4,957,000,000    
Loaned securities $ 84,000,000     $ 84,000,000            
Minimum requirement percentage of the fair value of the loaned securities to be held as cash collateral 102.00%     102.00%            
Cash collateral $ 86,000,000     $ 86,000,000            
Allowance for credit loss 209,000,000   83,000,000 $ 209,000,000 83,000,000     129,000,000    
Percentage of mortgage loans on real estate, interest rate       0.35%            
Separate account equity investment carrying value 44,000,000     $ 44,000,000       38,000,000    
Interest credited to policyholders account balances participating group annuity contracts 0   0 1,000,000 1,000,000          
Recurring                    
Net Investment Income [Line Items]                    
Trading securities, at fair value 293,000,000     293,000,000       283,000,000    
Forecast                    
Net Investment Income [Line Items]                    
Percentage of mortgage loans on real estate, interest rate           5.00%        
Commercial, Agricultural And Residential Mortgage Loan                    
Net Investment Income [Line Items]                    
Accrued investment income receivable 78,000,000     78,000,000       71,000,000    
Accrued interest written off       0 0          
Individually Assessed Mortgage loans                    
Net Investment Income [Line Items]                    
Mortgage loans foreclosure probable 0   0 0 0          
Allowance for credit loss 0   0 0 0          
Mortgage Loans                    
Net Investment Income [Line Items]                    
Non-accruing loans, carrying value 19,000,000     19,000,000       16,000,000    
Commercial mortgages:                    
Net Investment Income [Line Items]                    
Allowance for credit loss 203,000,000   $ 77,000,000 203,000,000 $ 77,000,000   $ 140,000,000 123,000,000 $ 58,000,000 $ 57,000,000
Troubled debt restructuring, postmodification   $ 56,000,000                
Fixed maturities                    
Net Investment Income [Line Items]                    
Accrued investment income receivable 568,000,000     568,000,000       550,000,000    
Accrued interest written off 0     0            
Amortized cost of fixed maturities available-for-sale 63,900,000,000     63,900,000,000       68,100,000,000    
Fixed maturities | Non-Investment Grade                    
Net Investment Income [Line Items]                    
Available-for-sale securities, amortized cost basis other than investment grade $ 2,600,000,000     $ 2,600,000,000       $ 2,900,000,000    
Percentage of available for sale securities 4.10%     4.10%       4.30%    
Unrealized loss on available for sale securities $ 151,000,000     $ 151,000,000       $ 208,000,000    
Corporate                    
Net Investment Income [Line Items]                    
Exposure in single issuer of total investments $ 400,000,000     $ 400,000,000       $ 327,000,000    
Debt securities exposure in single issuer of total investments, percentage 18.50%     18.50%       30.40%    
Amortized cost of fixed maturities available-for-sale $ 43,440,000,000     $ 43,440,000,000       $ 46,053,000,000    
12 months or longer, gross unrealized losses $ 7,139,000,000     $ 7,139,000,000       $ 4,222,000,000