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, 2017
Mar. 31, 2016
Dec. 31, 2016
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 $ 5,200    
Nonmarketable equity securities      
Schedule of Available-for-sale Securities [Line Items]      
Stock issued by Federal Reserve Banks included in other securities 303   $ 299
Federal Home Loan Bank of Cincinnati | Nonmarketable equity securities      
Schedule of Available-for-sale Securities [Line Items]      
Stock issued by the Federal Home Loan Bank included in other securities 249   $ 249
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 $ 3 $ 2