INVESTMENTS (DERIVATIVES GROSS COLLATERAL AMOUNTS LIABILITES) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	$ 1,784	$ 1,996
Investment Management
Offsetting Liabilities [Line Items]
Repurchase agreements, collateral cash held		(8)
Counterparty C
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	274
Repurchase agreements, collateral securities held	(274)
Repurchase agreements, collateral cash held	(2)
Securities sold under agreement to repurchase
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	1,782	1,992
Repurchase agreements, collateral securities held	(1,756)	(1,986)
Repurchase agreements, collateral cash held	(22)	(2)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	4	4
Securities sold under agreement to repurchase | Counterparty D
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	891	767
Repurchase agreements, collateral securities held	(877)	(767)
Repurchase agreements, collateral cash held	(11)	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	3	0
Securities sold under agreement to repurchase | Counterparty C
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet		302
Repurchase agreements, collateral securities held		(296)
Repurchase agreements, collateral cash held		(2)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	(2)	4
Securities sold under agreement to repurchase | Counterparty M
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	268	410
Repurchase agreements, collateral securities held	(262)	(410)
Repurchase agreements, collateral cash held	(4)	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	2	0
Securities sold under agreement to repurchase | Counterparty H
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	110
Repurchase agreements, collateral securities held	(108)
Repurchase agreements, collateral cash held	(2)
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0
Securities sold under agreement to repurchase | Counterparty W
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	239	513
Repurchase agreements, collateral securities held	(235)	(513)
Repurchase agreements, collateral cash held	(3)	0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	1	$ 0
Variable Interest Entity, Primary Beneficiary | Investment Management
Offsetting Liabilities [Line Items]
Repurchase agreements, collateral cash held	$ (13)