Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - NALs Past Due (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - NALs Past Due (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) $ 687 $ 714
Current 71,635 69,269
Purchased Credit Impaired   41
Consumer loans 84 93
Loans and leases [1] 72,406 70,117
90 or more days past due and accruing 132 115
30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 292 335
60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 122 108
90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 273 271
Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 138 114
Current 28,712 27,954
Purchased Credit Impaired   39
Consumer loans 0 0
Loans and leases 28,850 28,107
90 or more days past due and accruing 9 9
Commercial | Commercial and Industrial | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 47 35
Commercial | Commercial and Industrial | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 28 14
Commercial | Commercial and Industrial | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 63 65
Commercial | Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 20 22
Current 7,181 7,201
Purchased Credit Impaired   2
Consumer loans 0 0
Loans and leases 7,201 7,225
90 or more days past due and accruing 0 3
Commercial | Real Estate | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 2 10
Commercial | Real Estate | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 12 1
Commercial | Real Estate | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 6 11
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 93 117
Current 12,297 11,982
Purchased Credit Impaired   0
Consumer loans 0 1
Loans and leases 12,390 12,100
90 or more days past due and accruing 6 7
Consumer | Automobile | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 71 89
Consumer | Automobile | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 15 18
Consumer | Automobile | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 7 10
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 122 128
Current 9,783 9,969
Purchased Credit Impaired   0
Consumer loans 2 2
Loans and leases 9,907 10,099
90 or more days past due and accruing 16 18
Consumer | Home Equity | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 44 49
Consumer | Home Equity | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 19 19
Consumer | Home Equity | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 59 60
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 281 295
Current 9,644 8,642
Purchased Credit Impaired   0
Consumer loans 81 89
Loans and leases 10,006 9,026
90 or more days past due and accruing 96 72
Consumer | Residential Mortgage | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 108 129
Consumer | Residential Mortgage | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 40 48
Consumer | Residential Mortgage | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 133 118
Consumer | RV and Marine FInance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 11 16
Current 2,834 2,421
Purchased Credit Impaired   0
Consumer loans 1 1
Loans and leases 2,846 2,438
90 or more days past due and accruing 1 1
Consumer | RV and Marine FInance | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 8 11
Consumer | RV and Marine FInance | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 2 3
Consumer | RV and Marine FInance | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 1 2
Consumer | Other Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 22 22
Current 1,184 1,100
Purchased Credit Impaired   0
Consumer loans 0 0
Loans and leases 1,206 1,122
90 or more days past due and accruing 4 5
Consumer | Other Consumer | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 12 12
Consumer | Other Consumer | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 6 5
Consumer | Other Consumer | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) $ 4 $ 5
[1] Amounts represent loans for which Huntington has elected the fair value option.