Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan and Lease Portfolio Composition (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Loan and Lease Portfolio Composition (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial $ 29,196   $ 28,107      
Commercial real estate 7,073   7,225      
Automobile 12,375   12,100      
Home equity 9,850   10,099      
Residential mortgage 10,459   9,026      
Recreation Finance 3,152   2,438      
Other consumer 1,265   1,122      
Loans and leases [1] 73,370   70,117      
Allowance for loan and lease losses (761) $ (741) (691) $ (675) $ (668) $ (638)
Net loans and leases 72,609   69,426      
Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Automobile 12,375   12,099      
Home equity 9,848   10,097      
Residential mortgage 10,380   8,937      
Other consumer 1,265   1,122      
Allowance for loan and lease losses (218) (210) (209) (201) (193) (187)
Consumer | Automobile            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 12,375   12,100      
Consumer | Home Equity            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 9,850   10,099      
Consumer | Residential Mortgage            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 10,459   9,026      
Consumer | RV and Marine FInance            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 3,152   2,438      
Consumer | Other Consumer            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 1,265   1,122      
Commercial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Commercial and industrial 29,196   28,107      
Commercial real estate 7,073   7,225      
Allowance for loan and lease losses (543) $ (531) (482) $ (474) $ (475) $ (451)
Commercial | Commercial and Industrial            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases 29,196   28,107      
Commercial | Real Estate            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Loans and leases $ 7,073   $ 7,225      
[1] Amounts represent loans for which Huntington has elected the fair value option.