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, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) $ 668 $ 774
Current 74,332 74,047
Consumer loans 79 79
Loans and leases [1] 75,079 74,900
90 or more days past due and accruing 147 170
30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 297 362
60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 98 114
90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 273 298
Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 115 140
Current 30,857 30,465
Consumer loans 0 0
Loans and leases 30,972 30,605
90 or more days past due and accruing 3 7
Commercial | Commercial and Industrial | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 49 72
Commercial | Commercial and Industrial | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 18 17
Commercial | Commercial and Industrial | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 48 51
Commercial | Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 8 15
Current 6,787 6,827
Consumer loans 0 0
Loans and leases 6,795 6,842
90 or more days past due and accruing 0 0
Commercial | Real Estate | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 1 10
Commercial | Real Estate | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 3 0
Commercial | Real Estate | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 4 5
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 84 124
Current 12,188 12,305
Consumer loans 0 0
Loans and leases 12,272 12,429
90 or more days past due and accruing 6 8
Consumer | Automobile | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 64 95
Consumer | Automobile | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 13 19
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) 120 128
Current 9,429 9,593
Consumer loans 2 1
Loans and leases 9,551 9,722
90 or more days past due and accruing 15 17
Consumer | Home Equity | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 46 51
Consumer | Home Equity | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 18 21
Consumer | Home Equity | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 56 56
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 305 323
Current 10,503 10,327
Consumer loans 77 78
Loans and leases 10,885 10,728
90 or more days past due and accruing 116 131
Consumer | Residential Mortgage | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 116 108
Consumer | Residential Mortgage | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 38 47
Consumer | Residential Mortgage | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 151 168
Consumer | RV and Marine FInance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 13 17
Current 3,331 3,237
Consumer loans 0 0
Loans and leases 3,344 3,254
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 (1) 9 12
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) 23 27
Current 1,237 1,293
Consumer loans 0 0
Loans and leases 1,260 1,320
90 or more days past due and accruing 5 6
Consumer | Other Consumer | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 12 14
Consumer | Other Consumer | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) 6 7
Consumer | Other Consumer | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Past Due (1) $ 5 $ 6
[1] Amounts represent loans for which Huntington has elected the fair value option.