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INVESTMENTS - Narrative (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
issue
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
issue
Sep. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
issue
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Net Investment Income [Line Items]                
Number of positions in unrealized loss position | issue 5,220   5,220     2,060    
Debt securities exposure in single issuer greater than stated percentage of total investments 0.60%   0.60%          
Fixed maturities available-for-sale, amortized cost $ 75,320,000,000   $ 75,320,000,000     $ 73,429,000,000    
Gross unrealized losses 1,890,000,000   1,890,000,000     91,000,000    
Allowance for credit losses 83,000,000 $ 64,000,000 83,000,000 $ 64,000,000   62,000,000    
Non-accruing loans, carrying value 13,000,000   13,000,000          
Separate account equity investment carrying value 34,000,000   34,000,000     45,000,000    
Fixed maturities                
Net Investment Income [Line Items]                
Accrued investment income receivable 604,000,000   604,000,000     506,000,000    
Accrued interest, written off 0 0 0 0        
Fixed maturities available-for-sale, amortized cost 75,300,000,000   75,300,000,000     73,400,000,000    
Corporate                
Net Investment Income [Line Items]                
Exposure in single issuer of total investments $ 275,000,000   $ 275,000,000     $ 322,000,000    
Debt securities exposure in single issuer of total investments, percentage 5.70%   5.70%     2.50%    
Fixed maturities available-for-sale, amortized cost $ 52,643,000,000   $ 52,643,000,000     $ 50,172,000,000    
Gross unrealized losses 1,577,000,000   1,577,000,000     75,000,000    
Commercial mortgage loans                
Net Investment Income [Line Items]                
Accrued investment income receivable 63,000,000   63,000,000     57,000,000    
Accrued interest, written off     0 0        
Allowance for credit losses 77,000,000 60,000,000 77,000,000 60,000,000 $ 58,000,000 57,000,000 $ 59,000,000 $ 77,000,000
Non-accruing loans, carrying value           14,000,000    
Agricultural mortgage loans                
Net Investment Income [Line Items]                
Accrued investment income receivable 63,000,000   63,000,000     57,000,000    
Accrued interest, written off     0 0        
Allowance for credit losses 6,000,000 $ 4,000,000 6,000,000 $ 4,000,000 $ 6,000,000 5,000,000 $ 4,000,000 $ 4,000,000
Individually assessed mortgage loans                
Net Investment Income [Line Items]                
Mortgage loans foreclosure probable 0   0          
Allowance for credit losses 0   0          
Recurring                
Net Investment Income [Line Items]                
Investment gains (losses), net 631,000,000   631,000,000     631,000,000    
Other than investment grade | Non-investment grade | Fixed maturities                
Net Investment Income [Line Items]                
Available-for-sale securities, amortized cost basis other than investment grade $ 2,900,000,000   $ 2,900,000,000     $ 2,900,000,000    
Percentage of available for sale securities 3.90%   3.90%     3.90%    
Unrealized loss on available for sale securities $ 242,000,000   $ 242,000,000     $ 18,000,000