INVESTMENTS (GROSS UNREALIZED LOSSES) (Details) $ in Millions	Jun. 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	449	810
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	$ 2,272	$ 8,779
Less Than 12 Months, Gross Unrealized Losses	(29)	(546)
Greater than 12 Months, Fair Value	1,509	929
Greater Than 12 Months, Gross Unrealized Losses	(143)	(194)
Total, Fair Value	3,781	9,708
Total, Gross Unrealized Losses	(172)	(740)
Public corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	244	3,091
Less Than 12 Months, Gross Unrealized Losses	(1)	(129)
Greater than 12 Months, Fair Value	441	359
Greater Than 12 Months, Gross Unrealized Losses	(16)	(73)
Total, Fair Value	685	3,450
Total, Gross Unrealized Losses	(17)	(202)
Private corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	254	1,926
Less Than 12 Months, Gross Unrealized Losses	(3)	(102)
Greater than 12 Months, Fair Value	413	184
Greater Than 12 Months, Gross Unrealized Losses	(21)	(22)
Total, Fair Value	667	2,110
Total, Gross Unrealized Losses	(24)	(124)
U.S. Treasury, government and agency
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	1,596	3,538
Less Than 12 Months, Gross Unrealized Losses	(16)	(305)
Greater than 12 Months, Fair Value	326	0
Greater Than 12 Months, Gross Unrealized Losses	(9)	0
Total, Fair Value	1,922	3,538
Total, Gross Unrealized Losses	(25)	(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	0	0
Total, Fair Value	19	19
Total, Gross Unrealized Losses	0	(1)
Foreign Govts
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	9	73
Less Than 12 Months, Gross Unrealized Losses	0	(7)
Greater than 12 Months, Fair Value	72	39
Greater Than 12 Months, Gross Unrealized Losses	(9)	(11)
Total, Fair Value	81	112
Total, Gross Unrealized Losses	(9)	(18)
Commercial Mortgage- backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	55	67
Less Than 12 Months, Gross Unrealized Losses	(8)	(2)
Greater than 12 Months, Fair Value	214	261
Greater Than 12 Months, Gross Unrealized Losses	(86)	(85)
Total, Fair Value	269	328
Total, Gross Unrealized Losses	(94)	(87)
Residential Mortgage- backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	69	11
Less Than 12 Months, Gross Unrealized Losses	0	0
Greater than 12 Months, Fair Value	3	29
Greater Than 12 Months, Gross Unrealized Losses	0	0
Total, Fair Value	72	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	1	11
Less Than 12 Months, Gross Unrealized Losses	0	0
Greater than 12 Months, Fair Value	9	17
Greater Than 12 Months, Gross Unrealized Losses	(1)	(1)
Total, Fair Value	10	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	44	43
Less Than 12 Months, Gross Unrealized Losses	(1)	0
Greater than 12 Months, Fair Value	12	40
Greater Than 12 Months, Gross Unrealized Losses	(1)	(2)
Total, Fair Value	56	83
Total, Gross Unrealized Losses	$ (2)	$ (2)