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INVESTMENTS - Narrative (Details)
$ in Millions
Mar. 31, 2019
USD ($)
security
Dec. 31, 2018
USD ($)
security
Debt Securities, Available-for-sale [Line Items]    
Number of fixed maturities in an unrealized loss position greater than 12 months | security 674 1,471
Securities sold under agreements to repurchase $ 0 $ 573
Debt securities exposure in single issuer greater than stated percentage of total investments 0.70%  
AOCI Unrealized gain (loss) on AFS securities $ (5) (30)
Gross unrealized losses of twelve months or more 427 795
Trading securities, at fair value 12,704 15,166
Separate account equity investment carrying value 50 48
Corporate    
Debt Securities, Available-for-sale [Line Items]    
Debt securities exposure in single issuer of total investments $ 218 $ 210
Debt securities exposure in single issuer of total investments, percent 1.80% 1.70%
Fixed Maturities    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, amortized cost basis $ 44,926 $ 42,492
External Credit Rating, Non Investment Grade [Member] | Fixed Maturities | Other Than Investment Grade    
Debt Securities, Available-for-sale [Line Items]    
Available-for-sale securities, amortized cost $ 1,250 $ 1,228
Percentage of available for sale securities 2.80% 2.90%
Total Commercial Mortgage Loans    
Debt Securities, Available-for-sale [Line Items]    
Mortgage loans classified as nonaccrual $ 0 $ 19