DERIVATIVES - Schedule of Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Derivative Assets
Derivative Assets	$ 1,006		$ 790
Less: Gross amounts offset in the Consolidated Balance Sheets	(264)	[1]	(161)	[1]
Total net derivative fair values presented in the Consolidated Balance Sheets	742	[2]	629	[2]
Derivative Liabilities
Derivative Liabilities	880		773
Less: Gross amounts offset in the Consolidated Balance Sheets	(264)	[1]	(161)	[1]
Total net derivative fair values presented in the Consolidated Balance Sheets	616	[2]	612	[2]
Derivatives not designated as hedging instruments:
Derivative Assets
Derivative Assets	917		766
Derivative Liabilities
Derivative Liabilities	825		674
Interest rate swaps | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	7,500	[3]	5,750	[3]
Derivative Assets
Derivative Assets	89		24
Derivative Liabilities
Derivative Liabilities	55		99
Interest rate swaps | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	32,632	[3]	31,848	[3]
Derivative Assets
Derivative Assets	655		589
Derivative Liabilities
Derivative Liabilities	569		501
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	8,046	[3]	8,359	[3]
Derivative Assets
Derivative Assets	253		170
Derivative Liabilities
Derivative Liabilities	247		164
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	1,144	[3]	730	[3]
Derivative Assets
Derivative Assets	9		7
Derivative Liabilities
Derivative Liabilities	$ 9		$ 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.