COMMITMENTS AND CONTINGENCIES - Schedule of Outstanding Off-balance sheet Arrangements (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Other Commitments [Line Items]
Commitment amount	$ 58,077	$ 56,840
Undrawn commitments to extend credit
Other Commitments [Line Items]
Commitment amount	55,333	53,987
Financial standby letters of credit
Other Commitments [Line Items]
Commitment amount	2,498	2,556
Performance letters of credit
Other Commitments [Line Items]
Commitment amount	94	149
Commercial letters of credit
Other Commitments [Line Items]
Commitment amount	74	64
Marketing rights
Other Commitments [Line Items]
Commitment amount	51	54
Risk participation agreements
Other Commitments [Line Items]
Commitment amount	16	17
Residential mortgage loans sold with recourse
Other Commitments [Line Items]
Commitment amount	$ 11	$ 13