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INVESTMENTS - Narrative (Details)
3 Months Ended
Mar. 31, 2022
USD ($)
issue
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
issue
Dec. 31, 2020
USD ($)
Net Investment Income [Line Items]        
Number of unrealized loss positions | issue 7,799   1,896  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.60%      
Gross unrealized losses $ 295,000,000   $ 79,000,000  
Allowance for credit loss 53,000,000 $ 74,000,000 62,000,000  
Separate account equity investment carrying value 39,000,000   44,000,000  
Fixed maturities        
Net Investment Income [Line Items]        
Accrued investment income receivable 518,000,000   470,000,000  
Accrued interest, written off 0 0    
Amortized cost 68,900,000,000   68,600,000,000  
Corporate        
Net Investment Income [Line Items]        
Debt securities exposure in single issuer of total investments $ 253,000,000   $ 280,000,000  
Debt securities exposure in single issuer of total investments, percent 4.50%   3.20%  
Gross unrealized losses $ 245,000,000   $ 62,000,000  
Commercial mortgage loans        
Net Investment Income [Line Items]        
Accrued investment income receivable 58,000,000   57,000,000  
Accrued interest, written off 0 0    
Allowance for credit loss 47,000,000 70,000,000 57,000,000 $ 77,000,000
Non-accruing loans, carrying value 14,000,000   14,000,000  
Agricultural mortgage loans        
Net Investment Income [Line Items]        
Accrued investment income receivable 58,000,000   57,000,000  
Accrued interest, written off 0 0    
Allowance for credit loss 6,000,000 $ 4,000,000 5,000,000 $ 4,000,000
Individually assessed mortgage loans        
Net Investment Income [Line Items]        
Mortgage loans foreclosure probable 0      
Allowance for credit loss 0      
Recurring        
Net Investment Income [Line Items]        
Investment gains (losses), net 383,000,000   379,000,000  
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 $ 3,000,000,000   $ 2,800,000,000  
Percentage of available for sale securities 4.30%   4.10%  
Unrealized loss on available for sale securities $ 79,000,000   $ 18,000,000