INVESTMENTS (DERIVATIVES GROSS COLLATERAL AMOUNTS LIABILITES) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	$ 2,038	$ 1,890
Investment Management
Offsetting Liabilities [Line Items]
Repurchase agreements, collateral cash held		(12)
Counterparty D
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	675	234
Repurchase agreements, collateral securities held	(675)	(234)
Repurchase agreements, collateral cash held	0	0
Counterparty C
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet		1,033
Repurchase agreements, collateral securities held		(1,016)
Repurchase agreements, collateral cash held		(17)
Counterparty M
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	398	623
Repurchase agreements, collateral securities held	(398)	(611)
Repurchase agreements, collateral cash held	0	(12)
Counterparty H
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	965
Repurchase agreements, collateral securities held	(965)
Repurchase agreements, collateral cash held	0
Securities sold under agreement to repurchase
Offsetting Liabilities [Line Items]
Repurchase agreements, net amount presented on the balance sheet	2,038	1,890
Repurchase agreements, collateral securities held	(2,038)	(1,861)
Repurchase agreements, collateral cash held	$ 0	$ (29)