DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	$ 20,413	$ 13,370
Asset Derivatives Fair Value	620	345
Liability Derivatives Fair Value	(447)	(934)
AA
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	1,480	161
Asset Derivatives Fair Value	24	6
Liability Derivatives Fair Value	(24)	(7)
A
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	18,933	13,209
Asset Derivatives Fair Value	596	339
Liability Derivatives Fair Value	$ (423)	$ (927)