DERIVATIVES - Schedule of Derivative Instruments (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Derivative Assets
Derivative assets		$ 759	$ 807
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(106)	(178)
Less: Cash collateral applied	[1]	(26)	(4)
Total net derivative fair values presented in the Consolidated Balance Sheets	[2]	627	625
Derivative Liabilities
Derivative Liabilities		778	666
Less: Gross amounts offset in the Consolidated Balance Sheets	[1]	(106)	(178)
Less: Cash collateral applied	[1]	(13)	(3)
Total net derivative fair values presented in the Consolidated Balance Sheets	[2]	659	485
Derivatives not designated as hedging instruments:
Derivative Assets
Derivative assets		707	711
Derivative Liabilities
Derivative Liabilities		585	616
Interest rate swaps
Derivative Assets
Derivative assets		609	636
Derivative Liabilities
Derivative Liabilities		645	505
Interest rate swaps | Derivatives designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	13,350	16,750
Derivative Assets
Derivative assets		52	96
Derivative Liabilities
Derivative Liabilities		193	50
Interest rate swaps | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	54,656	33,719
Derivative Assets
Derivative assets		557	540
Derivative Liabilities
Derivative Liabilities		452	455
Foreign exchange contracts
Derivative Assets
Derivative assets		134	163
Derivative Liabilities
Derivative Liabilities		126	156
Foreign exchange contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	8,039	8,366
Derivative Assets
Derivative assets		134	163
Derivative Liabilities
Derivative Liabilities		126	156
Other contracts
Derivative Assets
Derivative assets		16	8
Derivative Liabilities
Derivative Liabilities		7	5
Other contracts | Derivatives not designated as hedging instruments:
Derivatives, Fair Value [Line Items]
Notional amount	[3]	1,498	981
Derivative Assets
Derivative assets		16	8
Derivative Liabilities
Derivative Liabilities		$ 7	$ 5

[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 do not measure the true economic risk of these contracts.