DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	$ 23,398	$ 23,662
Asset Derivatives Fair Value	706	802
Liability Derivatives Fair Value	(599)	(2,423)
AA
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	1,220	1,098
Asset Derivatives Fair Value	41	39
Liability Derivatives Fair Value	(51)	(36)
A
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	22,178	22,564
Asset Derivatives Fair Value	665	763
Liability Derivatives Fair Value	$ (548)	$ (2,387)