Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 28,850 $ 28,107
Commercial real estate 7,201 7,225
Automobile 12,390 12,100
Home equity 9,907 10,099
Residential mortgage 10,006 9,026
Other consumer 1,206 1,122
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 28,850 28,107
Commercial real estate 7,201 7,225
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 26,940 26,268
Commercial real estate 6,895 6,909
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,115 1,116
Commercial real estate 123 115
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 784 694
Commercial real estate 181 200
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 11 29
Commercial real estate 2 1
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 12,390 12,099
Home equity 9,905 10,097
Residential mortgage 9,925 8,937
RV and marine finance 2,845 2,437
Other consumer 1,206 1,122
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 6,338 6,102
Home equity 6,219 6,352
Residential mortgage 6,579 5,697
RV and marine finance 1,805 1,433
Other consumer 452 428
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,469 4,312
Home equity 3,014 3,024
Residential mortgage 2,598 2,581
RV and marine finance 887 863
Other consumer 580 540
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,296 1,390
Home equity 601 617
Residential mortgage 592 605
RV and marine finance 96 96
Other consumer 116 143
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 287 295
Home equity 71 104
Residential mortgage 156 54
RV and marine finance 57 45
Other consumer $ 58 $ 11