INVESTMENTS (DERIVATIVES GROSS COLLATERAL AMOUNTS ASSETS) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet	$ 1,784	$ 1,996
Net amounts presented in the balance sheets		(35)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral	12,589	13,585
Investment Management
Offsetting Assets [Line Items]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash		(8)
Net amounts presented in the balance sheets	33	13
Callateral Cash (Received)		(1)
Counterparty C
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet	274
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(274)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	(2)
Securities Borrowed | Investment Management
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Amount Offset Against Collateral		83
Variable Interest Entity, Primary Beneficiary | Investment Management
Offsetting Assets [Line Items]
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	(13)
Callateral Cash (Received)	(1)
Securities sold under agreement to repurchase
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet	1,782	1,992
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(1,756)	(1,986)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	(22)	(2)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	4	4
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,		0
Reverse repurchase agreements, collateral securities received		0
Reverse repurchase agreements, collateral cash received		0
Reverse repurchase agreements, net amounts		0
Securities sold under agreement to repurchase | Counterparty C
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet		302
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities		(296)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash		(2)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	(2)	4
Securities sold under agreement to repurchase | Counterparty D
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet	891	767
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(877)	(767)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	(11)	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	3	0
Securities sold under agreement to repurchase | Counterparty H
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet	110
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(108)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	(2)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0
Securities sold under agreement to repurchase | Counterparty M
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet	268	410
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(262)	(410)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	(4)	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	2	0
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,		0
Reverse repurchase agreements, collateral securities received		0
Reverse repurchase agreements, collateral cash received		0
Reverse repurchase agreements, net amounts		0
Securities sold under agreement to repurchase | Counterparty V
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,		0
Reverse repurchase agreements, collateral securities received		0
Reverse repurchase agreements, collateral cash received		0
Reverse repurchase agreements, net amounts		0
Securities sold under agreement to repurchase | Counterparty W
Offsetting Assets [Line Items]
Repurchase agreements, net amount presented on the Balance Sheet	239	513
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities	(235)	(513)
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	(3)	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	1	0
Other
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	2,933	2,120
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(881)	66
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,052	2,186
Derivative
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	951	53
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(881)	66
Derivative Asset, Fair Value, Amount Offset Against Collateral	70	119
Derivative | Counterparty A
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	51	46
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(49)	(48)
Derivative Asset, Fair Value, Amount Offset Against Collateral	2	(2)
Derivative | Counterparty B
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	(22)	(128)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	25	132
Derivative Asset, Fair Value, Amount Offset Against Collateral	3	4
Derivative | Counterparty C
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	(7)	(116)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	24	138
Derivative Asset, Fair Value, Amount Offset Against Collateral	17	22
Derivative | Counterparty D
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	159	182
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(160)	(176)
Derivative Asset, Fair Value, Amount Offset Against Collateral	(1)	6
Derivative | Counterparty E
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	17	(65)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(16)	83
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	18
Derivative | Counterparty F
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	84	(3)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(80)	16
Derivative Asset, Fair Value, Amount Offset Against Collateral	4	13
Derivative | Counterparty G
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	262	219
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(261)	(214)
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	5
Derivative | Counterparty H
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	188	104
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(188)	(110)
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	(6)
Derivative | Counterparty I
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	(16)	(188)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	17	203
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	15
Derivative | Counterparty J
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	(72)	(93)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	77	115
Derivative Asset, Fair Value, Amount Offset Against Collateral	5	22
Derivative | Counterparty K
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	94	92
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(93)	(96)
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	(4)
Derivative | Counterparty L
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	(2)	(3)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	2	3
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	0
Derivative | Counterparty M
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	53	(105)
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(39)	120
Derivative Asset, Fair Value, Amount Offset Against Collateral	14	15
Derivative | Counterparty N
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	0	4
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	4
Derivative | Counterparty Q
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	12	10
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(11)	(11)
Derivative Asset, Fair Value, Amount Offset Against Collateral	1	(1)
Derivative | Counterparty T
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	17	0
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(17)	2
Derivative Asset, Fair Value, Amount Offset Against Collateral	0	2
Derivative | Counterparty U
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	15	1
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(1)	10
Derivative Asset, Fair Value, Amount Offset Against Collateral	14	11
Derivative | Counterparty V
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	118	96
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	(111)	(101)
Derivative Asset, Fair Value, Amount Offset Against Collateral	7	(5)
Other Financial Instruments
Offsetting Assets [Line Items]
Net amounts presented in the balance sheets	1,982	2,067
Calleteral Securities (Received)	0	0
Callateral Cash (Received)	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral	1,982	$ 2,067
Securities purchased under agreement to resell
Reverse repurchase agreements [Abstract]
Securities purchased under agreements to resell, net amount presented in the Balance Sheet,	0
Reverse repurchase agreements, collateral securities received	0
Reverse repurchase agreements, collateral cash received	0
Reverse repurchase agreements, net amounts	$ 0