DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	$ 25,869	$ 23,662
Asset Derivatives Fair Value	752	802
Liability Derivatives Fair Value	(502)	(2,423)
AA
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	2,592	1,098
Asset Derivatives Fair Value	220	39
Liability Derivatives Fair Value	(32)	(36)
A
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	23,277	22,564
Asset Derivatives Fair Value	532	763
Liability Derivatives Fair Value	$ (470)	$ (2,387)