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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 positions in unrealized loss position | issue 3,978   565  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.60%      
Gross unrealized losses $ 341,000,000   $ 91,000,000  
Allowance for credit losses 53,000,000 $ 74,000,000 62,000,000  
Non-accruing loans, carrying value 14,000,000   14,000,000  
Separate account equity investment carrying value 40,000,000   45,000,000  
Fixed maturities        
Net Investment Income [Line Items]        
Accrued investment income receivable 559,000,000   506,000,000  
Accrued interest, written off 0 0    
Amortized cost 73,700,000,000   73,400,000,000  
Corporate Debt Securities [Member]        
Net Investment Income [Line Items]        
Exposure in single issuer of total investments $ 306,000,000   $ 322,000,000  
Debt securities exposure in single issuer of total investments, percentage 3.20%   2.50%  
Gross unrealized losses $ 292,000,000   $ 75,000,000  
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 losses 47,000,000 70,000,000 57,000,000 $ 77,000,000
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 losses 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 losses 0      
Recurring        
Net Investment Income [Line Items]        
Investment gains (losses), net 589,000,000   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 $ 3,000,000,000   $ 2,900,000,000  
Percentage of available for sale securities 4.10%   3.90%  
Unrealized loss on available for sale securities $ 79,000,000   $ 18,000,000