Annual report pursuant to Section 13 and 15(d)

DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details)

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DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative [Line Items]      
Increase (decrease) to net interest income due to derivative adjustment $ 108,000,000 $ 98,000,000 $ 95,000,000
Expected after-tax unrealized gains on cash flow hedging derivatives reclassified to earnings 3,000,000    
Purchase of interest rate caps and derivative financial instruments, notional value 14,152,100,000 600,000,000  
Notional amount corresponds to trading liabilities, fair value 1,000,000    
Total notional amount corresponds to trading assets, fair value (less than) 1,000,000    
Credit risks from interest rate swaps used for trading purposes 224,000,000 219,000,000  
Credit risk derivative fair value 6,000,000 7,000,000  
Aggregate credit risk, net of collateral 15,000,000 20,000,000  
Investment securities and cash collateral pledged by Huntington 110,000,000    
Investment securities and cash collateral pledged to Huntington 107,000,000    
Swap      
Derivative [Line Items]      
Gross amounts of recognized liabilities (less than) 1,000,000    
Derivative used in trading activity      
Derivative [Line Items]      
Net derivative asset (liability) 76,000,000 74,000,000  
Derivative financial instruments used by Huntington on behalf of customers including offsetting derivatives, notional value 14,600,000,000 14,400,000,000  
Derivative used in Mortgage Banking Activities      
Derivative [Line Items]      
Gross amounts of recognized liabilities (less than) 1,459,000 4,019,000  
Purchase of interest rate caps and derivative financial instruments, notional value 500,000,000    
Gains (losses) related to derivative instruments Included in total MSR (2,000,000) 7,000,000 $ (25,000,000)
Net derivative asset (liability) 7,730,000 80,000  
Other Credit Derivatives      
Derivative [Line Items]      
Derivative asset notional amount $ 344,000,000 $ 457,000,000