DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Net Derivatives Notional Amount	$ 23,662	$ 22,475
Assets Derivatives Fair Value	802	488
Liability Derivatives Fair Value	(2,423)	(837)
AA
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Net Derivatives Notional Amount	1,098	161
Assets Derivatives Fair Value	39	1
Liability Derivatives Fair Value	(36)	(7)
A
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Net Derivatives Notional Amount	22,564	22,314
Assets Derivatives Fair Value	763	487
Liability Derivatives Fair Value	$ (2,387)	$ (830)