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INVESTMENTS - Narrative (Details)
3 Months Ended
Mar. 31, 2020
USD ($)
security
Dec. 31, 2019
USD ($)
security
Net Investment Income [Line Items]    
Number of positions in unrealized loss position | security 1,723 413
Debt securities exposure in single issuer greater than stated percentage of total investments 0.60%  
Amortized cost $ 65,042,000,000  
Unrealized loss on available for sale securities 217,000,000  
Gross unrealized losses 111,000,000 $ 32,000,000
Allowance for credit loss 46,000,000  
Separate account equity investment carrying value 46,000,000 58,000,000
Corporate    
Net Investment Income [Line Items]    
Exposure in single issuer of total investments $ 286,000,000 $ 309,000,000
Debt securities exposure in single issuer of total investments, percentage 1.30% 2.00%
Gross unrealized losses $ 90,000,000 $ 20,000,000
Fixed maturities    
Net Investment Income [Line Items]    
Accrued investment income receivable 498,000,000  
Accrued interest, written off 1,000,000  
Amortized cost 65,044,000,000 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 32,000,000
Accrued interest, written off 0  
Individually Assessed Mortgage Loans    
Net Investment Income [Line Items]    
Mortgage loans foreclosure probable 0  
Allowance for credit loss 0  
Commercial Real Estate Portfolio Segment    
Net Investment Income [Line Items]    
Allowance for credit loss 43,000,000 33,000,000
Non-accruing Loans 0 0
Fair Value, Measurements, Recurring    
Net Investment Income [Line Items]    
Trading securities, at fair value 6,534,000,000 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 $ 1,700,000,000 $ 1,400,000,000
Percentage of available for sale securities 2.60% 2.30%
Unrealized loss on available for sale securities   $ 21,000,000