DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Derivative Assets
Derivative assets		$ 807	$ 790
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(178)	(161)
Less: Cash collateral applied	[1]	(4)	0
Total net derivative fair values presented in the Consolidated Balance Sheets	[2]	625	629
Derivative Liabilities
Derivative Liabilities		666	773
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(178)	(161)
Less: Cash collateral applied	[1]	(3)	0
Total net derivative fair values presented in the Consolidated Balance Sheets	[2]	485	612
Derivatives not designated as hedging instruments:
Derivative Assets
Derivative assets		711	766
Derivative Liabilities
Derivative Liabilities		616	674
Interest rate swaps
Derivative Assets
Derivative assets		636	613
Derivative Liabilities
Derivative Liabilities		505	600
Interest rate swaps | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	16,750	5,750
Derivative Assets
Derivative assets		96	24
Derivative Liabilities
Derivative Liabilities		50	99
Interest rate swaps | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	33,719	31,848
Derivative Assets
Derivative assets		540	589
Derivative Liabilities
Derivative Liabilities		455	501
Foreign exchange contracts
Derivative Assets
Derivative assets		163	170
Derivative Liabilities
Derivative Liabilities		156	164
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	8,366	8,359
Derivative Assets
Derivative assets		163	170
Derivative Liabilities
Derivative Liabilities		156	164
Other contracts
Derivative Assets
Derivative assets		8	7
Derivative Liabilities
Derivative Liabilities		5	9
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	981	730
Derivative Assets
Derivative assets		8	7
Derivative Liabilities
Derivative Liabilities		$ 5	$ 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 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. Notional amounts are 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.