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INVESTMENTS - Narrative (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
issue
Dec. 31, 2020
USD ($)
issue
Dec. 31, 2019
USD ($)
Net Investment Income [Line Items]      
Number of unrealized loss positions | issue 1,896 537  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.60%    
Gross unrealized losses $ 79,000,000 $ 39,000,000  
Allowance for credit loss 62,000,000 81,000,000  
Separate account equity investment carrying value 44,000,000 43,000,000  
Expense in securities sold under agreement to repurchase 2,000,000 2,000,000 $ 2,000,000
Fixed maturities      
Net Investment Income [Line Items]      
Accrued investment income receivable 470,000,000 499,000,000  
Accrued interest, written off 0 0  
Amortized cost 68,600,000,000 68,100,000,000  
Corporate      
Net Investment Income [Line Items]      
Debt securities exposure in single issuer of total investments $ 280,000,000 $ 338,000,000  
Debt securities exposure in single issuer of total investments, percent 3.20% 2.90%  
Gross unrealized losses $ 62,000,000 $ 32,000,000  
Commercial mortgage loans      
Net Investment Income [Line Items]      
Accrued investment income receivable 57,000,000    
Accrued interest, written off 0 0  
Agricultural mortgage loans      
Net Investment Income [Line Items]      
Accrued investment income receivable 58,000,000    
Accrued interest, written off 0 0  
Individually assessed mortgage loans      
Net Investment Income [Line Items]      
Mortgage loans foreclosure probable 0    
Allowance for credit loss 0    
Commercial Mortgage Loans      
Net Investment Income [Line Items]      
Allowance for credit loss 57,000,000 77,000,000 $ 33,000,000
Non-accruing loans, carrying value 14,000,000 0  
Recurring      
Net Investment Income [Line Items]      
Investment gains (losses), net 379,000,000 5,340,000,000  
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 $ 2,800,000,000 $ 2,400,000,000  
Percentage of available for sale securities 4.10% 3.60%  
Unrealized loss on available for sale securities $ 18,000,000 $ 48,000,000