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INVESTMENTS (NET INVESTMENT INCOME) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Net Investment Income [Line Items]      
Investment income $ 2,648 $ 2,384 $ 2,113
Investment expenses (65) (66) (56)
Net investment income (loss) 2,583 2,318 2,057
Net investment income (loss) from derivatives (125) 16 (20)
Realized gains (losses) on contracts closed 1,601 (458) (555)
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Abstract]      
Expense in securities sold under agreement to repurchase 3   4
Fixed maturities      
Net Investment Income [Line Items]      
Investment income 1,365 1,418 1,420
Net investment income (loss) from derivatives (130) (3) (17)
Mortgage loans on real estate      
Net Investment Income [Line Items]      
Investment income 453 461 338
Net investment income (loss) from derivatives 2 (2) (1)
Real estate held for the production of income      
Net Investment Income [Line Items]      
Investment income 2 0 0
Repurchase agreement      
Net Investment Income [Line Items]      
Investment income 0 1 1
Other equity investments      
Net Investment Income [Line Items]      
Investment income 188 170 84
Net investment income (loss) from derivatives 3 (2) (5)
Policy loans      
Net Investment Income [Line Items]      
Investment income 205 210 213
Trading securities      
Net Investment Income [Line Items]      
Investment income 381 80 17
Other investment income      
Net Investment Income [Line Items]      
Investment income 54 44 40
Net investment income (loss) from derivatives $ 0 $ 23 $ 3