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
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial and industrial $ 28,622 $ 28,107    
Commercial real estate 7,412 7,225    
Automobile 12,146 12,100    
Home equity 9,987 10,099    
Residential mortgage 9,357 9,026    
Recreation Finance 2,549 2,438    
Other consumer 1,090 1,122    
Loans and leases [1] 71,163 70,117    
Allowance for loan and lease losses (721) (691) $ (673) $ (638)
Net loans and leases 70,442 69,426    
Loans Receivable, Fair Value Disclosure 86 93    
Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Automobile 12,145 12,099    
Home equity 9,985 10,097    
Residential mortgage 9,275 8,937    
Other consumer 1,090 1,122    
Allowance for loan and lease losses (206) (209) (193) (187)
Consumer | Automobile        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 12,146 12,100    
Loans Receivable, Fair Value Disclosure 1 1    
Consumer | Home Equity        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 9,987 10,099    
Loans Receivable, Fair Value Disclosure 2 2    
Consumer | Residential Mortgage        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 9,357 9,026    
Loans Receivable, Fair Value Disclosure 82 89    
Consumer | RV and Marine FInance        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 2,549 2,438    
Loans Receivable, Fair Value Disclosure 1 1    
Consumer | Other Consumer        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 1,090 1,122    
Loans Receivable, Fair Value Disclosure 0 0    
Commercial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Commercial and industrial 28,622 28,107    
Commercial real estate 7,412 7,225    
Allowance for loan and lease losses (515) (482) $ (480) $ (451)
Commercial | Commercial and Industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 28,622 28,107    
Loans Receivable, Fair Value Disclosure 0 0    
Commercial | Real Estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Loans and leases 7,412 7,225    
Loans Receivable, Fair Value Disclosure $ 0 $ 0    
[1] Amounts represent loans for which Huntington has elected the fair value option.