INVESTMENTS (DERIVATIVES GROSS COLLATERAL AMOUNTS ASSETS) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,	$ 205	$ 79
Securities sold under agreements to repurchase	2,038	1,890
Accrued interest derivatives	101	141
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	13,988	12,055
Investment Management
Offsetting Assets [Line Items]
Callateral Cash (Received)		(2)
Reverse repurchase agreements [Abstract]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash		(12)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	76	13
Counterparty A
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	55	52
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(50)	(52)
Derivative Asset, Fair Value, Amount Offset Against Collateral	5	0
Counterparty B
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	18	9
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(18)	(7)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	2
Counterparty C
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	105	61
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(105)	(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	246	222
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(241)	(218)
Derivative Asset, Fair Value, Amount Offset Against Collateral	5	4
Reverse repurchase agreements [Abstract]
Securities sold under agreements to repurchase	675	234
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(675)	(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	67	53
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(64)	(53)
Derivative Asset, Fair Value, Amount Offset Against Collateral	3	0
Counterparty F
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	12	(2)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(12)	2
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Counterparty G
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	136	129
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(134)	(129)
Derivative Asset, Fair Value, Amount Offset Against Collateral	2	0
Counterparty H
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	11	16
Calleteral Securities (Received)	(11)	(11)
Callateral Cash (Received)	0	(5)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Reverse repurchase agreements [Abstract]
Securities sold under agreements to repurchase	965
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(965)
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	108	44
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(108)	(39)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	5
Counterparty J
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	40	19
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(28)	(13)
Derivative Asset, Fair Value, Amount Offset Against Collateral	12	6
Counterparty K
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	25	17
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(18)	(17)
Derivative Asset, Fair Value, Amount Offset Against Collateral	7	0
Counterparty L
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	5	7
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(5)	(7)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Counterparty M
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	60	11
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(60)	(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,	205	28
Reverse repurchase agreements, collateral securities received	(205)	(28)
Reverse repurchase agreements, collateral cash received	0	0
Reverse repurchase agreements, net amounts	0	0
Securities sold under agreements to repurchase	398	623
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(398)	(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	16	20
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	16	20
Counterparty Q
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	0	0
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	1	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	0
Counterparty T
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	10	(3)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(10)	3
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Counterparty U
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	5	0
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(4)	1
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	1
Counterparty V
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	8	3
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(7)	(3)
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	0
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,		51
Reverse repurchase agreements, collateral securities received		(51)
Reverse repurchase agreements, collateral cash received		0
Reverse repurchase agreements, net amounts		0
Derivative
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	927	658
Calleteral Securities (Received)	(11)	(11)
Callateral Cash (Received)	(863)	(605)
Derivative Asset, Fair Value, Amount Offset Against Collateral	53	42
Other Financial Instruments
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	1,317	1,271
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,317	1,271
Other
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	2,244	1,929
Calleteral Securities (Received)	(11)	(11)
Callateral Cash (Received)	(863)	(605)
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,370	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,	205
Reverse repurchase agreements, collateral securities received	(205)
Reverse repurchase agreements, collateral cash received	0
Reverse repurchase agreements, net amounts	0
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	2,038	1,890
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(2,038)	(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	26	75
Securities Loaned
Reverse repurchase agreements [Abstract]
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	17	$ 10
Variable Interest Entity, Primary Beneficiary | Investment Management
Offsetting Assets [Line Items]
Callateral Cash (Received)	(3)
Reverse repurchase agreements [Abstract]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	$ (21)