Annual report pursuant to Section 13 and 15(d)

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

v3.8.0.1
AVAILABLE-FOR-SALE AND OTHER SECURITIES - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2017
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 $ 6,000  
Nonmarketable equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Stock issued by Federal Reserve Banks included in other securities 293 $ 299
Nonmarketable equity securities | Federal Home Loan Bank of Cincinnati    
Schedule of Available-for-sale Securities [Line Items]    
Federal home loan bank stock $ 287 $ 249