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
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due $ 629 $ 714
Current 70,448 69,269
Purchased Credit Impaired   41
Consumer loans 86 93
Loans and leases [1] 71,163 70,117
90 or more days past due and accruing 106 115
30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 279 335
60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 89 108
90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 261 271
Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 117 114
Current 28,505 27,954
Purchased Credit Impaired   39
Consumer loans 0 0
Loans and leases 28,622 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 39 35
Commercial | Commercial and Industrial | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 13 14
Commercial | Commercial and Industrial | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 65 65
Commercial | Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 19 22
Current 7,393 7,201
Purchased Credit Impaired   2
Consumer loans 0 0
Loans and leases 7,412 7,225
90 or more days past due and accruing 1 3
Commercial | Real Estate | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 13 10
Commercial | Real Estate | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 0 1
Commercial | Real Estate | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 6 11
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 87 117
Current 12,058 11,982
Purchased Credit Impaired   0
Consumer loans 1 1
Loans and leases 12,146 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 66 89
Consumer | Automobile | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 13 18
Consumer | Automobile | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 8 10
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 137 128
Current 9,848 9,969
Purchased Credit Impaired   0
Consumer loans 2 2
Loans and leases 9,987 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 55 49
Consumer | Home Equity | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 20 19
Consumer | Home Equity | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 62 60
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 241 295
Current 9,034 8,642
Purchased Credit Impaired   0
Consumer loans 82 89
Loans and leases 9,357 9,026
90 or more days past due and accruing 69 72
Consumer | Residential Mortgage | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 89 129
Consumer | Residential Mortgage | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 37 48
Consumer | Residential Mortgage | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 115 118
Consumer | RV and Marine FInance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 11 16
Current 2,537 2,421
Purchased Credit Impaired   0
Consumer loans 1 1
Loans and leases 2,549 2,438
90 or more days past due and accruing 2 1
Consumer | RV and Marine FInance | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 8 11
Consumer | RV and Marine FInance | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 2 3
Consumer | RV and Marine FInance | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 1 2
Consumer | Other Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 17 22
Current 1,073 1,100
Purchased Credit Impaired   0
Consumer loans 0 0
Loans and leases 1,090 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 9 12
Consumer | Other Consumer | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due 4 5
Consumer | Other Consumer | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due $ 4 $ 5
[1] Amounts represent loans for which Huntington has elected the fair value option.