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INVESTMENTS - Narrative (Details)
3 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
security
Dec. 31, 2020
USD ($)
numberOfLoan
security
Dec. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
Net Investment Income [Line Items]        
Number of unrealized loss positions | security 537 537 390  
Debt securities exposure in single issuer greater than stated percentage of total investments 0.60% 0.60%    
Amortized cost $ 68,123,000,000 $ 68,123,000,000    
Unrealized loss on available for sale securities 48,000,000 48,000,000 $ 21,000,000  
Gross unrealized losses 39,000,000 39,000,000 32,000,000  
Allowance for credit loss 81,000,000 81,000,000    
Separate account equity investment carrying value 43,000,000 43,000,000 58,000,000  
Expense in securities sold under agreement to repurchase   2,000,000 2,000,000 $ 3,000,000
Fixed maturities        
Net Investment Income [Line Items]        
Accrued investment income receivable 499,000,000 499,000,000    
Accrued interest, written off 0 0    
Amortized cost 68,136,000,000 68,136,000,000 59,278,000,000  
Corporate        
Net Investment Income [Line Items]        
Debt securities exposure in single issuer of total investments $ 338,000,000 $ 338,000,000 $ 279,000,000  
Debt securities exposure in single issuer of total investments, percent 2.90% 2.90% 2.40%  
Gross unrealized losses $ 32,000,000 $ 32,000,000 $ 20,000,000  
Commercial Mortgage Loans        
Net Investment Income [Line Items]        
Accrued investment income receivable $ 30,000,000 30,000,000    
Accrued interest, written off   $ 0    
Number of troubled debt restructuring | numberOfLoan   1    
Troubled debt restructuring, premodification   $ 75,000,000    
Troubled debt restructuring, postmodification   $ 75,000,000    
Troubled debt restructuring, percentage of total invested assets 0.07% 0.07%    
Agricultural Mortgage Loans        
Net Investment Income [Line Items]        
Accrued investment income receivable $ 28,000,000 $ 28,000,000    
Accrued interest, written off   0    
Individually Assessed Mortgage Loans        
Net Investment Income [Line Items]        
Mortgage loans foreclosure probable 0 0    
Allowance for credit loss $ 0 $ 0    
Privately Negotiated Fixed Maturity        
Net Investment Income [Line Items]        
Number of troubled debt restructuring | numberOfLoan   7    
Troubled debt restructuring, premodification   $ 54,000,000    
Troubled debt restructuring, postmodification   $ 48,000,000    
Troubled debt restructuring, percentage of total invested assets 0.05% 0.05%    
Fair Value, Recurring        
Net Investment Income [Line Items]        
Investment gains (losses), net $ 5,340,000,000 $ 5,340,000,000 6,598,000,000  
Other Than Investment Grade | External Credit Rating, Non Investment Grade | Fixed maturities        
Net Investment Income [Line Items]        
Available-for-sale securities, amortized cost $ 2,400,000,000 $ 2,400,000,000 $ 1,400,000,000  
Percentage of available for sale securities 3.60% 3.60% 2.30%