INVESTMENTS (GROSS UNREALIZED LOSSES) (Details) $ in Millions	Sep. 30, 2016 USD ($) securities	Dec. 31, 2015 USD ($) securities
Investments, Debt and Equity Securities [Abstract]
Number of fixed maturities in an unrealized loss position greater than 12 months | securities	423	810
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	$ 1,773	$ 8,779
Less Than 12 Months, Gross Unrealized Losses	(31)	(546)
Greater than 12 Months, Fair Value	743	929
Greater Than 12 Months, Gross Unrealized Losses	(111)	(194)
Total, Fair Value	2,516	9,708
Total, Gross Unrealized Losses	(142)	(740)
Public corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	401	3,091
Less Than 12 Months, Gross Unrealized Losses	(2)	(129)
Greater than 12 Months, Fair Value	170	359
Greater Than 12 Months, Gross Unrealized Losses	(8)	(73)
Total, Fair Value	571	3,450
Total, Gross Unrealized Losses	(10)	(202)
Private corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	302	1,926
Less Than 12 Months, Gross Unrealized Losses	(1)	(102)
Greater than 12 Months, Fair Value	270	184
Greater Than 12 Months, Gross Unrealized Losses	(19)	(22)
Total, Fair Value	572	2,110
Total, Gross Unrealized Losses	(20)	(124)
U.S. Treasury, government and agency
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	907	3,538
Less Than 12 Months, Gross Unrealized Losses	(20)	(305)
Greater than 12 Months, Fair Value	0	0
Greater Than 12 Months, Gross Unrealized Losses	0	0
Total, Fair Value	907	3,538
Total, Gross Unrealized Losses	(20)	(305)
State and Political Sub- divisions
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	0	19
Less Than 12 Months, Gross Unrealized Losses	0	(1)
Greater than 12 Months, Fair Value	19	0
Greater Than 12 Months, Gross Unrealized Losses	(1)	0
Total, Fair Value	19	19
Total, Gross Unrealized Losses	(1)	(1)
Foreign Govts
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	2	73
Less Than 12 Months, Gross Unrealized Losses	0	(7)
Greater than 12 Months, Fair Value	51	39
Greater Than 12 Months, Gross Unrealized Losses	(8)	(11)
Total, Fair Value	53	112
Total, Gross Unrealized Losses	(8)	(18)
Commercial Mortgage- backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	65	67
Less Than 12 Months, Gross Unrealized Losses	(8)	(2)
Greater than 12 Months, Fair Value	207	261
Greater Than 12 Months, Gross Unrealized Losses	(74)	(85)
Total, Fair Value	272	328
Total, Gross Unrealized Losses	(82)	(87)
Residential Mortgage- backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	96	11
Less Than 12 Months, Gross Unrealized Losses	0	0
Greater than 12 Months, Fair Value	5	29
Greater Than 12 Months, Gross Unrealized Losses	0	0
Total, Fair Value	101	40
Total, Gross Unrealized Losses	0	0
Asset- backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	0	11
Less Than 12 Months, Gross Unrealized Losses	0	0
Greater than 12 Months, Fair Value	8	17
Greater Than 12 Months, Gross Unrealized Losses	(1)	(1)
Total, Fair Value	8	28
Total, Gross Unrealized Losses	(1)	(1)
Redeemable Preferred Stock
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	0	43
Less Than 12 Months, Gross Unrealized Losses	0	0
Greater than 12 Months, Fair Value	13	40
Greater Than 12 Months, Gross Unrealized Losses	0	(2)
Total, Fair Value	13	83
Total, Gross Unrealized Losses	$ 0	$ (2)