ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Narrative (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended			9 Months Ended		12 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Total commercial		Dec. 31, 2013 Total commercial		Sep. 30, 2014 Total retail
Financing Receivable, Modifications [Line Items]
High loan to value criteria	90.00%	90.00%
TDR balance				$ 140	[1]	$ 167	[1]	$ 1,200	[1]
Commitments to lend additional funds to debtors owing receivables which were TDRs	$ 48		$ 52

[1] Includes modifications that consist of multiple concessions, one of which is a maturity extension (unless one of the other concessions was an interest rate reduction).