Quarterly report pursuant to Section 13 or 15(d)

NON-INTEREST INCOME - Disaggregation by Segment (Details)

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NON-INTEREST INCOME - Disaggregation by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers $ 214  
Other noninterest income 100  
Noninterest income 314 $ 312
Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 86  
Cards and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 49  
Trust and investment management services    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 44  
Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 21  
Other Income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 14  
Operating Segments | Consumer And Business Banking [Member]    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 140  
Other noninterest income 34  
Noninterest income 174 171
Operating Segments | Consumer And Business Banking [Member] | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 68  
Operating Segments | Consumer And Business Banking [Member] | Cards and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 47  
Operating Segments | Consumer And Business Banking [Member] | Trust and investment management services    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 7  
Operating Segments | Consumer And Business Banking [Member] | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 8  
Operating Segments | Consumer And Business Banking [Member] | Other Income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 10  
Operating Segments | Commercial Banking [Member]    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 20  
Other noninterest income 49  
Noninterest income 69 64
Operating Segments | Commercial Banking [Member] | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 16  
Operating Segments | Commercial Banking [Member] | Cards and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 2  
Operating Segments | Commercial Banking [Member] | Trust and investment management services    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1  
Operating Segments | Commercial Banking [Member] | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1  
Operating Segments | Commercial Banking [Member] | Other Income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0  
Operating Segments | Vehicle Finance [Member]    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 2  
Other noninterest income 1  
Noninterest income 3 5
Operating Segments | Vehicle Finance [Member] | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1  
Operating Segments | Vehicle Finance [Member] | Cards and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0  
Operating Segments | Vehicle Finance [Member] | Trust and investment management services    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0  
Operating Segments | Vehicle Finance [Member] | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0  
Operating Segments | Vehicle Finance [Member] | Other Income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1  
Operating Segments | Regional Banking and The Huntington Private Client Group [Member]    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 51  
Other noninterest income 0  
Noninterest income 51 48
Operating Segments | Regional Banking and The Huntington Private Client Group [Member] | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1  
Operating Segments | Regional Banking and The Huntington Private Client Group [Member] | Cards and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0  
Operating Segments | Regional Banking and The Huntington Private Client Group [Member] | Trust and investment management services    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 36  
Operating Segments | Regional Banking and The Huntington Private Client Group [Member] | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 11  
Operating Segments | Regional Banking and The Huntington Private Client Group [Member] | Other Income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 3  
Treasury / Other    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1  
Other noninterest income 16  
Noninterest income 17 $ 24
Treasury / Other | Service charges on deposit accounts    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0  
Treasury / Other | Cards and payment processing income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0  
Treasury / Other | Trust and investment management services    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 0  
Treasury / Other | Insurance income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers 1  
Treasury / Other | Other Income    
Disaggregation of Revenue [Line Items]    
Noninterest income from contracts with customers $ 0