DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Derivative Assets
Derivative assets		$ 822	$ 790
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(157)	(161)
Total net derivative fair values presented in the Consolidated Balance Sheets	[2]	665	629
Derivative Liabilities
Derivative Liabilities		713	773
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(157)	(161)
Total net derivative fair values presented in the Consolidated Balance Sheets	[2]	556	612
Derivatives not designated as hedging instruments:
Derivative Assets
Derivative assets		727	766
Derivative Liabilities
Derivative Liabilities		632	674
Interest rate swaps
Derivative Assets
Derivative assets		639	613
Derivative Liabilities
Derivative Liabilities		540	600
Interest rate swaps | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	9,500	5,750
Derivative Assets
Derivative assets		95	24
Derivative Liabilities
Derivative Liabilities		81	99
Interest rate swaps | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	33,052	31,848
Derivative Assets
Derivative assets		544	589
Derivative Liabilities
Derivative Liabilities		459	501
Foreign exchange contracts
Derivative Assets
Derivative assets		172	170
Derivative Liabilities
Derivative Liabilities		167	164
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	7,820	8,359
Derivative Assets
Derivative assets		172	170
Derivative Liabilities
Derivative Liabilities		167	164
Other contracts
Derivative Assets
Derivative assets		11	7
Derivative Liabilities
Derivative Liabilities		6	9
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	1,310	730
Derivative Assets
Derivative assets		11	7
Derivative Liabilities
Derivative Liabilities		$ 6	$ 9

[1] Amounts represent the impact of legally enforceable master netting agreements that allow the Company to settle positive and negative positions.

[2] The Company also offsets assets and liabilities associated with repurchase agreements on the Consolidated Balance Sheets. See Note 2 “Securities” for further information.

[3] The notional or contractual amount of interest rate derivatives and foreign exchange contracts is the amount upon which interest and other payments under the contract are based. For interest rate derivatives, the notional amount is typically not exchanged. Therefore, notional amounts should not be taken as the measure of credit or market risk, as they tend to greatly overstate the true economic risk of these contracts.