FAIR VALUE DISCLOSURES (Fair Value Measurement Reconciliation for All Levels) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total Gains Losses Realized Unrealized Included In [Abstract]
Gain (Loss) on Investments		$ (20)	$ (58)	$ (99)
Transfers into level 3			15
Transfers into level 3		(125)	(82)
Level 3 Assets And Liabilities Still Held
Total Gains Losses Realized Unrealized Included In [Abstract]
Gain (Loss) on Investments		36	15
Increase (decrease) in the fair value of the reinsurance contracts		(141)	3,964
Policyholders' benefits		(184)	128
Other comprehensive income (loss)		30	127
Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Transfers into level 3		99
Public corporate | Level 3 Assets And Liabilities Still Held
Total Gains Losses Realized Unrealized Included In [Abstract]
Other comprehensive income (loss)		(25)	6
Public corporate | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(380)	(291)	(355)
Investment Income, Net		3	2	2
Gain (Loss) on Investments		2	3	5
Subtotal		5	5	7
Other comprehensive income (loss)		(25)	6	(1)
Purchases		60	162	70
Sales		(38)	(30)	(150)
Transfers into level 3		99	15	20
Transfers into level 3		(61)	(69)	(10)
Closing Balance		(420)	(380)	(291)
States and political subdivisions | Level 3 Assets And Liabilities Still Held
Total Gains Losses Realized Unrealized Included In [Abstract]
Other comprehensive income (loss)		(2)	2
States and political subdivisions | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(47)	(46)	(50)
Investment Income, Net		0	0	0
Gain (Loss) on Investments		0	0	0
Subtotal		0	0	0
Other comprehensive income (loss)		(1)	2	(3)
Purchases		0	0	0
Sales		(1)	(1)	(1)
Transfers into level 3		0	0	0
Transfers into level 3		0	0	0
Closing Balance		(45)	(47)	(46)
Foreign governments | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		0	0	(19)
Investment Income, Net		0	0	0
Gain (Loss) on Investments		0	0	0
Subtotal		0	0	0
Other comprehensive income (loss)		0	0	(2)
Purchases		1	0	0
Sales		0	0	(17)
Transfers into level 3		0	0	0
Transfers into level 3		0	0	0
Closing Balance		(1)	0	0
Commercial mortgage-backed | Level 3 Assets And Liabilities Still Held
Total Gains Losses Realized Unrealized Included In [Abstract]
Other comprehensive income (loss)		61	112
Commercial mortgage-backed | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(715)	(700)	(900)
Investment Income, Net		1	2	0
Gain (Loss) on Investments		(38)	(89)	(68)
Subtotal		(37)	(87)	(68)
Other comprehensive income (loss)		64	135	13
Purchases		0	0	31
Sales		(175)	(20)	(160)
Transfers into level 3		0	0	0
Transfers into level 3		(64)	(13)	(16)
Closing Balance		(503)	(715)	(700)
Residential Mortgage Backed Securities | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(2)	(4)	(9)
Investment Income, Net		0	0	0
Gain (Loss) on Investments		0	0	0
Subtotal		0	0	0
Other comprehensive income (loss)		0	0	(1)
Purchases		0	0	0
Sales		(2)	(2)	(4)
Transfers into level 3		0	0	0
Transfers into level 3		0	0	0
Closing Balance		0	(2)	(4)
Asset-backed Securities
Total Gains Losses Realized Unrealized Included In [Abstract]
Other comprehensive income (loss)		(4)	7
Asset-backed Securities | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(53)	(83)	(113)
Investment Income, Net		0	0	0
Gain (Loss) on Investments		0	0	0
Subtotal		0	0	0
Other comprehensive income (loss)		(4)	7	3
Purchases		0	0	0
Sales		(9)	(37)	(22)
Transfers into level 3		0	0	0
Transfers into level 3		0	0	(11)
Closing Balance		(40)	(53)	(83)
Redeemable preferred stock | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		0	(15)	$ (15)
Investment Income, Net		0	0
Gain (Loss) on Investments		0	0	$ 0
Increase (decrease) in the fair value of the reinsurance contracts		0	0	0
Policyholders' benefits		0	0	0
Subtotal		0	0	0
Other comprehensive income (loss)		0	0	0
Purchases		0	0	0
Sales		0	(15)	0
Settlements		0	0	0
Transfers into level 3		0	0	0
Transfers into level 3		0	0	0
Closing Balance		0	0	(15)
Contingent Payment Arrangements | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(42)	(38)
Investment Income, Net		0	0
Gain (Loss) on Investments		0	0
Increase (decrease) in the fair value of the reinsurance contracts		0	0
Policyholders' benefits		0	0
Subtotal		0	0
Other comprehensive income (loss)		0
Purchases		0	9
Sales		(11)	(5)
Settlements		0	0
Transfers into level 3		0	0
Transfers into level 3		0	0
Closing Balance		(31)	(42)	(38)
Other equity investments | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(61)	(52)	(77)
Investment Income, Net		0	3	10
Gain (Loss) on Investments		5	1	(7)
Increase (decrease) in the fair value of the reinsurance contracts		0	0	0
Policyholders' benefits		0	0	0
Subtotal		5	4	3
Other comprehensive income (loss)		2	0	0
Purchases		1	8	4
Sales		(20)	(1)	(3)
Settlements		0	0	0
Transfers into level 3		0	0	0
Transfers into level 3		0	(2)	(29)
Closing Balance		(49)	(61)	(52)
Gmib Reinsurance | Level 3 Assets And Liabilities Still Held
Total Gains Losses Realized Unrealized Included In [Abstract]
Increase (decrease) in the fair value of the reinsurance contracts		(141)	3,964
Gmib Reinsurance | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(10,711)	(6,747)	$ (11,044)
Investment Income, Net		0	0
Gain (Loss) on Investments		0	0	$ 0
Increase (decrease) in the fair value of the reinsurance contracts		(327)	3,774	(4,496)
Policyholders' benefits		0	0	0
Subtotal		(327)	3,774	(4,496)
Other comprehensive income (loss)		0	0	0
Purchases		228	225	237
Sales		(42)	(35)	(38)
Settlements		0	0	0
Transfers into level 3		0	0	0
Transfers into level 3		0	0	0
Closing Balance		(10,570)	(10,711)	(6,747)
Separate Accounts | Level 3 Assets And Liabilities Still Held
Total Gains Losses Realized Unrealized Included In [Abstract]
Gain (Loss) on Investments		36	15
Separate Accounts | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(260)	(237)	$ (224)
Investment Income, Net		0	0
Gain (Loss) on Investments		36	15	$ 10
Increase (decrease) in the fair value of the reinsurance contracts		0	0	0
Policyholders' benefits		0	0	0
Subtotal		36	15	10
Other comprehensive income (loss)		0	0	(1)
Purchases		26	16	6
Sales		(2)	(3)	(3)
Settlements		(5)	(5)	(2)
Transfers into level 3		0	0	3
Transfers into level 3		(2)	0	0
Closing Balance		(313)	(260)	(237)
GIB and GWBL and Other Features | Level 3 Assets And Liabilities Still Held
Total Gains Losses Realized Unrealized Included In [Abstract]
Policyholders' benefits		(184)	(128)
GIB and GWBL and Other Features | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance		(128)	0	$ (265)
Investment Income, Net		0	0
Gain (Loss) on Investments		0	0	$ 0
Increase (decrease) in the fair value of the reinsurance contracts		0	0	0
Policyholders' benefits		(130)	(8)	(351)
Subtotal		(130)	(8)	(351)
Other comprehensive income (loss)		0	0	0
Purchases		186	136	86
Sales		0	0	0
Settlements		0	0	0
Transfers into level 3		0	0	0
Transfers into level 3		0	0	0
Closing Balance		(184)	(128)	0
Other Invested Assets | Level 3
Total Gains Losses Realized Unrealized Included In [Abstract]
Beginning Balance			0	$ 2
Investment Income, Net
Gain (Loss) on Investments				$ 0
Increase (decrease) in the fair value of the reinsurance contracts				0
Policyholders' benefits				0
Subtotal				0
Other comprehensive income (loss)				2
Purchases				0
Sales				0
Settlements				0
Transfers into level 3				0
Transfers into level 3				0
Closing Balance				$ 0
Total Debt Maturities Available For Sale
Total Gains Losses Realized Unrealized Included In [Abstract]
Other comprehensive income (loss)		$ 30	$ 127
Fair Value Measurement Changes in Significant Assumptions | GWBL and other features liability
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Income from Continuing Operations	$ 37
Fair Value Measurement Changes in Significant Assumptions | Gmib Reinsurance
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Income from Continuing Operations	$ 510