DERIVATIVES - Schedule of Derivative Instruments (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
Derivative Assets
Derivative Assets	$ 790,000,000		$ 778,000,000
Less: Gross amounts offset in the Consolidated Balance Sheets	(161,000,000)	[1]	(128,000,000)	[1]
Total net derivative fair values presented in the Consolidated Balance Sheets	629,000,000	[2]	650,000,000	[2]
Derivative Liabilities
Derivative Liabilities	773,000,000		1,067,000,000
Less: Gross amounts offset in the Consolidated Balance Sheets	(161,000,000)	[1]	(128,000,000)	[1]
Total net derivative fair values presented in the Consolidated Balance Sheets	612,000,000	[2]	939,000,000	[2]
Derivatives not designated as hedging instruments:
Derivative Assets
Derivative Assets	766,000,000		755,000,000
Derivative Liabilities
Derivative Liabilities	674,000,000		655,000,000
Interest rate swaps | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	5,750,000,000	[3]	5,500,000,000	[3]
Derivative Assets
Derivative Assets	24,000,000		23,000,000
Derivative Liabilities
Derivative Liabilities	99,000,000		412,000,000
Interest rate swaps | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	31,848,000,000	[3]	29,355,000,000	[3]
Derivative Assets
Derivative Assets	589,000,000		654,000,000
Derivative Liabilities
Derivative Liabilities	501,000,000		558,000,000
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	8,359,000,000	[3]	7,771,000,000	[3]
Derivative Assets
Derivative Assets	170,000,000		94,000,000
Derivative Liabilities
Derivative Liabilities	164,000,000		87,000,000
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional Amount	730,000,000	[3]	569,000,000	[3]
Derivative Assets
Derivative Assets	7,000,000		7,000,000
Derivative Liabilities
Derivative Liabilities	$ 9,000,000		$ 10,000,000

[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 3 “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.