INVESTMENTS - CREDIT LOSS IMPAIRMENTS (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 973	$ 1,287	$ 4,774	$ 1,822
Gross gains on sales	6	5	140	34
Gross losses on sales	(4)	(2)	(59)	(29)
Total OTTI	(4)	0	(4)	(13)
Non-credit losses recognized in OCI	0	0	0	0
Credit losses recognized in net income (loss)	(4)	0	(4)	(13)
Fixed Maturities - Credit Loss Impairments
Balances, beginning of period	(9)	(115)	(10)	(190)
Previously recognized impairments on securities that matured, paid, prepaid or sold	0	32	1	120
Recognized impairments on securities impaired to fair value this period	0	0	0	0
Impairments recognized this period on securities not previously impaired	(4)	0	(4)	(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	$ (13)	$ (83)	$ (13)	$ (83)