INVESTMENTS (DERIVATIVES GROSS COLLATERAL AMOUNTS ASSETS) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,	$ 673	$ 79
Securities sold under agreements to repurchase	2,488	1,890
Accrued interest derivatives	137	141
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	15,738	12,055
Investment Management
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	66	13
Callateral Cash (Received)		(2)
Reverse repurchase agreements [Abstract]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash		(12)
Counterparty A
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	67	52
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(53)	(52)
Derivative Asset, Fair Value, Amount Offset Against Collateral	14	0
Counterparty B
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	73	9
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(73)	(7)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	2
Counterparty C
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	160	61
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(160)	(58)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	3
Reverse repurchase agreements [Abstract]
Securities sold under agreements to repurchase		1,033
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities		(1,016)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash		(17)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral		0
Counterparty D
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	271	222
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(271)	(218)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	4
Reverse repurchase agreements [Abstract]
Securities sold under agreements to repurchase	735	234
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(735)	(234)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	0	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0	0
Counterparty E
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	106	53
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(106)	(53)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Counterparty F
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	100	(2)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(100)	2
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Counterparty G
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	196	129
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(171)	(129)
Derivative Asset, Fair Value, Amount Offset Against Collateral	25	0
Counterparty H
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	25	16
Calleteral Securities (Received)	(22)	(11)
Callateral Cash (Received)	0	(5)
Derivative Asset, Fair Value, Amount Offset Against Collateral	3	0
Reverse repurchase agreements [Abstract]
Securities sold under agreements to repurchase	478
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(478)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0
Counterparty I
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	160	44
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(160)	(39)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	5
Counterparty J
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	106	19
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(106)	(13)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	6
Counterparty K
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	39	17
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(18)	(17)
Derivative Asset, Fair Value, Amount Offset Against Collateral	21	0
Counterparty L
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	7	7
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(7)	(7)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Counterparty M
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	141	11
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(141)	(10)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	1
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,	137	28
Reverse repurchase agreements, collateral securities received	(82)	(28)
Reverse repurchase agreements, collateral cash received	0	0
Reverse repurchase agreements, net amounts	55	0
Securities sold under agreements to repurchase	1,272	623
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(1,272)	(611)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	0	(12)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0	0
Counterparty N
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	13	20
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	13	20
Counterparty Q
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	2	0
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(2)	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Counterparty T
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	19	(3)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(18)	3
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	0
Counterparty U
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	19	0
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(17)	1
Derivative Asset, Fair Value, Amount Offset Against Collateral	2	1
Counterparty V
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	15	3
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	2	(3)
Derivative Asset, Fair Value, Amount Offset Against Collateral	17	0
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,	536	51
Reverse repurchase agreements, collateral securities received	(536)	(51)
Reverse repurchase agreements, collateral cash received	0	0
Reverse repurchase agreements, net amounts		0
Derivative
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	1,519	658
Calleteral Securities (Received)	(22)	(11)
Callateral Cash (Received)	(1,401)	(605)
Derivative Asset, Fair Value, Amount Offset Against Collateral	96	42
Other Financial Instruments
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	1,116	1,271
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,116	1,271
Other
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	2,635	1,929
Calleteral Securities (Received)	(22)	(11)
Callateral Cash (Received)	(1,401)	(605)
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,212	1,313
Securities purchased under agreement to resell
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,	673
Reverse repurchase agreements, collateral securities received	(618)
Reverse repurchase agreements, collateral cash received	0
Reverse repurchase agreements, net amounts	55
Securities Sold under Agreements to Repurchase
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,		79
Reverse repurchase agreements, collateral securities received		(79)
Reverse repurchase agreements, collateral cash received		0
Reverse repurchase agreements, net amounts		0
Securities sold under agreements to repurchase	2,485	1,890
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(2,485)	(1,861)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	0	(29)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0	0
Securities Borrowed | Investment Management
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral	34	75
Securities Loaned
Reverse repurchase agreements [Abstract]
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	13	$ 10
Variable Interest Entity, Primary Beneficiary | Investment Management
Offsetting Assets [Line Items]
Callateral Cash (Received)	(1)
Reverse repurchase agreements [Abstract]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	$ (15)