INVESTMENTS (GROSS UNREALIZED LOSSES) (Details) $ in Millions	Mar. 31, 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	522	810
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	$ 2,616	$ 8,779
Less Than 12 Months, Gross Unrealized Losses	(83)	(546)
Greater than 12 Months, Fair Value	2,763	929
Greater Than 12 Months, Gross Unrealized Losses	(249)	(194)
Total, Fair Value	5,379	9,708
Total, Gross Unrealized Losses	(332)	(740)
Public corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	1,001	3,091
Less Than 12 Months, Gross Unrealized Losses	(45)	(129)
Greater than 12 Months, Fair Value	568	359
Greater Than 12 Months, Gross Unrealized Losses	(47)	(73)
Total, Fair Value	1,569	3,450
Total, Gross Unrealized Losses	(92)	(202)
Private corporate
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	617	1,926
Less Than 12 Months, Gross Unrealized Losses	(23)	(102)
Greater than 12 Months, Fair Value	450	184
Greater Than 12 Months, Gross Unrealized Losses	(31)	(22)
Total, Fair Value	1,067	2,110
Total, Gross Unrealized Losses	(54)	(124)
U.S. Treasury, government and agency
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	808	3,538
Less Than 12 Months, Gross Unrealized Losses	(8)	(305)
Greater than 12 Months, Fair Value	1,380	0
Greater Than 12 Months, Gross Unrealized Losses	(68)	0
Total, Fair Value	2,188	3,538
Total, Gross Unrealized Losses	(76)	(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	45	73
Less Than 12 Months, Gross Unrealized Losses	(2)	(7)
Greater than 12 Months, Fair Value	47	39
Greater Than 12 Months, Gross Unrealized Losses	(9)	(11)
Total, Fair Value	92	112
Total, Gross Unrealized Losses	(11)	(18)
Commercial Mortgage- backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	50	67
Less Than 12 Months, Gross Unrealized Losses	(5)	(2)
Greater than 12 Months, Fair Value	245	261
Greater Than 12 Months, Gross Unrealized Losses	(91)	(85)
Total, Fair Value	295	328
Total, Gross Unrealized Losses	(96)	(87)
Residential Mortgage- backed
Available For Sale Securities Continuous Unrealized Loss Position [Line Items]
Less Than 12 Months, Fair Value	40	11
Less Than 12 Months, Gross Unrealized Losses	0	0
Greater than 12 Months, Fair Value	28	29
Greater Than 12 Months, Gross Unrealized Losses	0	0
Total, Fair Value	68	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	14	17
Greater Than 12 Months, Gross Unrealized Losses	(1)	(1)
Total, Fair Value	15	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	54	43
Less Than 12 Months, Gross Unrealized Losses	0	0
Greater than 12 Months, Fair Value	12	40
Greater Than 12 Months, Gross Unrealized Losses	(1)	(2)
Total, Fair Value	66	83
Total, Gross Unrealized Losses	$ (1)	$ (2)