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
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) $ 707 $ 714
Current 72,582 69,269
Purchased Credit Impaired   41
Consumer loans 81 93
Loans and leases [1] 73,370 70,117
90 or more days past due and accruing 154 115
30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 315 335
60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 101 108
90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 291 271
Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 123 114
Current 29,073 27,954
Purchased Credit Impaired   39
Consumer loans 0 0
Loans and leases 29,196 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) 48 35
Commercial | Commercial and Industrial | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 17 14
Commercial | Commercial and Industrial | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 58 65
Commercial | Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 14 22
Current 7,059 7,201
Purchased Credit Impaired   2
Consumer loans 0 0
Loans and leases 7,073 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) 6 10
Commercial | Real Estate | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 1 1
Commercial | Real Estate | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 7 11
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 101 117
Current 12,274 11,982
Purchased Credit Impaired   0
Consumer loans 0 1
Loans and leases 12,375 12,100
90 or more days past due and accruing 7 7
Consumer | Automobile | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 77 89
Consumer | Automobile | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 16 18
Consumer | Automobile | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 8 10
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 123 128
Current 9,725 9,969
Purchased Credit Impaired   0
Consumer loans 2 2
Loans and leases 9,850 10,099
90 or more days past due and accruing 15 18
Consumer | Home Equity | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 46 49
Consumer | Home Equity | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 17 19
Consumer | Home Equity | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 60 60
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 309 295
Current 10,071 8,642
Purchased Credit Impaired   0
Consumer loans 79 89
Loans and leases 10,459 9,026
90 or more days past due and accruing 117 72
Consumer | Residential Mortgage | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 116 129
Consumer | Residential Mortgage | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 42 48
Consumer | Residential Mortgage | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 151 118
Consumer | RV and Marine FInance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 13 16
Current 3,139 2,421
Purchased Credit Impaired   0
Consumer loans 0 1
Loans and leases 3,152 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) 9 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) 2 2
Consumer | Other Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 24 22
Current 1,241 1,100
Purchased Credit Impaired   0
Consumer loans 0 0
Loans and leases 1,265 1,122
90 or more days past due and accruing 5 5
Consumer | Other Consumer | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 13 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) $ 5 $ 5
[1] Amounts represent loans for which Huntington has elected the fair value option.