DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Net Derivatives Notional Amount	$ 22,127	$ 23,662
Assets Derivatives Fair Value	676	802
Liability Derivatives Fair Value	(371)	(2,423)
AA
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Net Derivatives Notional Amount	2,187	1,098
Assets Derivatives Fair Value	166	39
Liability Derivatives Fair Value	(35)	(36)
A
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Net Derivatives Notional Amount	19,940	22,564
Assets Derivatives Fair Value	510	763
Liability Derivatives Fair Value	$ (336)	$ (2,387)