DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	$ 39,238	$ 22,127
Asset Derivatives Fair Value	1,662	676
Liability Derivatives Fair Value	(601)	(371)
AA
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	4,193	2,187
Asset Derivatives Fair Value	123	166
Liability Derivatives Fair Value	(110)	(35)
A
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	33,946	19,940
Asset Derivatives Fair Value	1,482	510
Liability Derivatives Fair Value	(425)	(336)
BBB
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	1,099	0
Asset Derivatives Fair Value	57	0
Liability Derivatives Fair Value	$ (66)	$ 0