Quarterly report pursuant to Section 13 or 15(d)

AVAILABLE-FOR-SALE AND OTHER SECURITIES - Narrative (Details)

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AVAILABLE-FOR-SALE AND OTHER SECURITIES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]      
Pledged investment securities to secure public and trust deposits, trading account liabilities, US Treasury demand notes and security repurchase agreements $ 2,900    
Non-marketable equity securities      
Schedule of Available-for-sale Securities [Line Items]      
Stock issued by Federal Reserve Banks included in other securities 176   $ 176
Federal Home Loan Bank of Cincinnati [Member] | Non-marketable equity securities      
Schedule of Available-for-sale Securities [Line Items]      
Stock issued by the Federal Home Loan Bank included in other securities 157   $ 157
Commercial      
Schedule of Available-for-sale Securities [Line Items]      
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets $ 2 $ 2