DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions		Sep. 30, 2015	Dec. 31, 2014
Derivative Assets
Derivative assets		$ 1,010	$ 790
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(172)	(161)
Total net derivative fair values presented in the Consolidated Balance Sheets	[2]	838	629
Derivative Liabilities
Derivative Liabilities		816	773
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(172)	(161)
Less: Cash collateral applied	[1]	(3)	0
Total net derivative fair values presented in the Consolidated Balance Sheets	[2]	641	612
Derivatives not designated as hedging instruments:
Derivative Assets
Derivative assets		837	766
Derivative Liabilities
Derivative Liabilities		748	674
Interest rate swaps
Derivative Assets
Derivative assets		837	613
Derivative Liabilities
Derivative Liabilities		648	600
Interest rate swaps | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	11,000	5,750
Derivative Assets
Derivative assets		173	24
Derivative Liabilities
Derivative Liabilities		68	99
Interest rate swaps | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	31,628	31,848
Derivative Assets
Derivative assets		664	589
Derivative Liabilities
Derivative Liabilities		580	501
Foreign exchange contracts
Derivative Assets
Derivative assets		163	170
Derivative Liabilities
Derivative Liabilities		158	164
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	7,783	8,359
Derivative Assets
Derivative assets		163	170
Derivative Liabilities
Derivative Liabilities		158	164
Other contracts
Derivative Assets
Derivative assets		10	7
Derivative Liabilities
Derivative Liabilities		10	9
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	1,081	730
Derivative Assets
Derivative assets		10	7
Derivative Liabilities
Derivative Liabilities		$ 10	$ 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.