INVESTMENTS (AVAILABLE FOR SALE SECURITIES) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 31,235	$ 30,831
Gross Unrealized Gains	1,432	2,498
Gross Unrealized Losses	742	257
Fair Value	31,925	33,072
OTTI in AOCI	12	13
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Subtotal, Fair Value	31,893	33,034
Available For Sale Fixed Maturities Proceeds Gross Gains And Gross Losses From Sales And Other Than Temporary Impairments [Abstract]
Proceeds from sales	979	716	$ 3,220
Gross gains on sales	33	21	71
Gross losses on sales	(8)	(9)	(88)
Total other-than-temporary impairment losses	(41)	(72)	(81)
Non-credit losses recognized in OCI	0	0	15
Net impairment losses recognized	(41)	(72)	(66)
Fixed Maturities - Credit Loss Impairments
Recognized impairments on securities impaired to fair value this period	(11)	0
Increases due to passage of time on previously recorded credit losses	0	0
Accretion of previously recognized impairments due to increases in expected cash flows	0	0
Public corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	12,890	13,808
Gross Unrealized Gains	688	1,140
Gross Unrealized Losses	202	51
Fair Value	13,376	14,897
OTTI in AOCI	0	0
Private corporate
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,818	6,934
Gross Unrealized Gains	232	409
Gross Unrealized Losses	124	20
Fair Value	6,926	7,323
OTTI in AOCI	0	0
U.S. Treasury, government and agency
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,800	6,685
Gross Unrealized Gains	280	672
Gross Unrealized Losses	305	26
Fair Value	8,775	7,331
OTTI in AOCI	0	0
States and political subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	437	441
Gross Unrealized Gains	68	78
Gross Unrealized Losses	1	0
Fair Value	504	519
OTTI in AOCI	0	0
Foreign governments
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	397	405
Gross Unrealized Gains	36	48
Gross Unrealized Losses	18	7
Fair Value	415	446
OTTI in AOCI	0	0
Commercial mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	591	855
Gross Unrealized Gains	29	22
Gross Unrealized Losses	87	142
Fair Value	533	735
OTTI in AOCI	9	10
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost Basis, without Single Maturity Date	591
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, without Single Maturity Date	533
Residential mortgage-backed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	608	752
Gross Unrealized Gains	32	43
Gross Unrealized Losses	0	0
Fair Value	640	795
OTTI in AOCI	0	0
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost Basis, without Single Maturity Date	608
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, without Single Maturity Date	640
Asset-backed
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	68	86
Gross Unrealized Gains	10	14
Gross Unrealized Losses	1	1
Fair Value	77	99
OTTI in AOCI	3	3
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Amortized Cost Basis, without Single Maturity Date	68
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Fair Value, without Single Maturity Date	77
Redeemable preferred stock
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	592	829
Gross Unrealized Gains	57	70
Gross Unrealized Losses	2	10
Fair Value	647	889
OTTI in AOCI	0	0
Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	31,201	30,795
Gross Unrealized Gains	1,432	2,496
Gross Unrealized Losses	740	257
Fair Value	31,893	33,034
OTTI in AOCI	12	13
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract]
Due in one year or less, Amortized Cost	1,469
Due in years two through five, Amortized Cost	7,012
Due in years six through ten, Amortized Cost	10,429
Due after ten years, Amortized Cost	10,432
Subtotal, Amortized Cost Basis	29,342
Amortized Cost Basis, without Single Maturity Date	30,609
Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract]
Due in one year or less, Fair Value	1,486
Due in years two through five, Fair Value	7,395
Due in years six through ten, Fair Value	10,406
Due after ten years, Fair Value	10,709
Subtotal, Fair Value	29,996
Fair Value, without Single Maturity Date	31,246
Fixed Maturities - Credit Loss Impairments
Balance beginning of period	(254)	(370)
Previously recognized impairments on securities that matured, paid, prepaid or sold	97	188
Impairments recognized this period on securities not previously impaired	(22)	(41)
Additional impairments this period on securities previously impaired	(8)	(31)
Balances at December 31,	(198)	(254)	$ (370)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	34	36
Gross Unrealized Gains	0	2
Gross Unrealized Losses	2	0
Fair Value	32	38
OTTI in AOCI	$ 0	$ 0