DERIVATIVE INSTRUMENTS - Fair Value and Notional Amounts of Derivatives With Counterparty Credit Risk (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	$ 34,451	$ 43,927
Asset Derivatives Fair Value	580	1,207
Liability Derivatives Fair Value	(1,099)	(1,998)
AA
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	6,391	6,844
Asset Derivatives Fair Value	125	247
Liability Derivatives Fair Value	(172)	(308)
A
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	27,619	36,019
Asset Derivatives Fair Value	449	900
Liability Derivatives Fair Value	(862)	(1,621)
BBB
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Notional Amount of Derivatives	441	1,064
Asset Derivatives Fair Value	6	60
Liability Derivatives Fair Value	$ (65)	$ (69)