INVESTMENTS - CREDIT LOSS IMPAIRMENTS (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 373	$ 121	$ 3,801	$ 535
Gross gains on sales	7	10	134	29
Gross losses on sales	(14)	(7)	(55)	(27)
Total OTTI	0	(13)	0	(13)
Non-credit losses recognized in OCI	0	0	0	0
Credit losses recognized in net income (loss)	0	(13)	0	(13)
Fixed Maturities - Credit Loss Impairments
Balances, beginning of period	(10)	(147)	(10)	(190)
Previously recognized impairments on securities that matured, paid, prepaid or sold	1	45	1	88
Recognized impairments on securities impaired to fair value this period	0	0	0	0
Impairments recognized this period on securities not previously impaired	0	(13)	0	(13)
Additional impairments this period on securities previously impaired	0	0	0	0
Increases due to passage of time on previously recorded credit losses	0	0	0	0
Accretion of previously recognized impairments due to increases in expected cash flows	0	0	0	0
Balances, end of period	$ (9)	$ (115)	$ (9)	$ (115)