DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Derivative [Line Items]
Fair Value of Swaps	$ (176)	$ (156)
Notional Amount of Swaps	6,056	5,491
AA
Derivative [Line Items]
Fair Value of Swaps	0	0
Notional Amount of Swaps	0	0
A
Derivative [Line Items]
Fair Value of Swaps	(176)	(156)
Notional Amount of Swaps	$ 6,056	$ 5,491