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INVESTMENTS - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
security
Jun. 30, 2020
USD ($)
security
numberOfTroubledDebtRestructuring
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
security
Net Investment Income [Line Items]        
Number of positions in unrealized loss position | security 652 652   413
Debt securities exposure in single issuer greater than stated percentage of total investments 0.70% 0.70%    
Amortized cost $ 67,502,000,000 $ 67,502,000,000    
Unrealized loss on available for sale securities 113,000,000 113,000,000    
Gross unrealized losses 59,000,000 59,000,000   $ 32,000,000
Allowance for credit loss $ 66,000,000 $ 66,000,000    
Number of troubled debt restructuring | numberOfTroubledDebtRestructuring   4    
Troubled debt restructuring, premodification   $ 42,000,000    
Troubled debt restructuring, postmodification   $ 37,000,000    
Troubled debt restructuring, percentage of total invested assets 0.04% 0.04%    
Separate account equity investment carrying value $ 38,000,000 $ 38,000,000   58,000,000
Corporate        
Net Investment Income [Line Items]        
Exposure in single issuer of total investments $ 367,000,000 $ 367,000,000   $ 309,000,000
Debt securities exposure in single issuer of total investments, percentage 1.90% 1.90%   2.00%
Gross unrealized losses $ 53,000,000 $ 53,000,000   $ 20,000,000
Fixed maturities        
Net Investment Income [Line Items]        
Accrued investment income receivable 514,000,000 514,000,000    
Accrued interest, written off 0 0    
Amortized cost 67,515,000,000 67,515,000,000   62,937,000,000
Commercial Real Estate and Agricultural Real Estate Portfolio Segment        
Net Investment Income [Line Items]        
Accrued investment income receivable 28,000,000 28,000,000   29,000,000
Commercial Real Estate Portfolio Segment        
Net Investment Income [Line Items]        
Accrued interest, written off 1,000,000 1,000,000    
Allowance for credit loss 62,000,000 62,000,000 $ 43,000,000 33,000,000
Non-accruing Loans 75,000,000 75,000,000   0
Agricultural Mortgage Loans        
Net Investment Income [Line Items]        
Accrued interest, written off 0 0    
Individually Assessed Mortgage Loans        
Net Investment Income [Line Items]        
Mortgage loans foreclosure probable 0 0    
Allowance for credit loss 0 0    
Fair Value, Measurements, Recurring        
Net Investment Income [Line Items]        
Trading securities, at fair value 6,616,000,000 6,616,000,000   7,031,000,000
Other Than Investment Grade | External Credit Rating, Non Investment Grade | Fixed maturities        
Net Investment Income [Line Items]        
Available-for-sale securities, amortized cost basis other than investment grade $ 1,900,000,000 $ 1,900,000,000   $ 1,400,000,000
Percentage of available for sale securities 2.90% 2.90%   2.30%
Unrealized loss on available for sale securities       $ 21,000,000