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INVESTMENTS (NET INVESTMENT INCOME) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net Investment Income [Line Items]      
Investment expenses $ (66) $ (56) $ (55)
Net investment income (loss) from derivatives 16 (20) (58)
Realized gains (losses) on contracts closed (458) (555) 706
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Abstract]      
Interest Credited To Policyholders Account Balances Participating Group Annuity Contracts 4 4 5
Fixed maturities      
Net Investment Income [Line Items]      
Investment income 1,418 1,420 1,431
Net investment income (loss) from derivatives (3) (17) (54)
Mortgage loans on real estate      
Net Investment Income [Line Items]      
Investment income 461 338 306
Net investment income (loss) from derivatives (2) (1) (3)
Repurchase agreement      
Net Investment Income [Line Items]      
Investment income 1 1 0
Other equity investments      
Net Investment Income [Line Items]      
Investment income 170 84 200
Policy loans      
Net Investment Income [Line Items]      
Investment income 210 213 216
Derivative investments      
Net Investment Income [Line Items]      
Net investment income (loss) from derivatives (4) 474 899
Trading securities      
Net Investment Income [Line Items]      
Investment income 80 17 63
Real Estate Investment      
Net Investment Income [Line Items]      
Net investment income (loss) from derivatives (2) (5) (2)
Other Investments      
Net Investment Income [Line Items]      
Investment income 44 40 49
Net investment income (loss) from derivatives $ 23 $ 3 $ 1