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
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 29,196 $ 28,107
Commercial real estate 7,073 7,225
Automobile 12,375 12,100
Home equity 9,850 10,099
Residential mortgage 10,459 9,026
Other consumer 1,265 1,122
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 29,196 28,107
Commercial real estate 7,073 7,225
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 27,407 26,268
Commercial real estate 6,766 6,909
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,104 1,116
Commercial real estate 117 115
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 678 694
Commercial real estate 189 200
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 7 29
Commercial real estate 1 1
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 12,375 12,099
Home equity 9,848 10,097
Residential mortgage 10,380 8,937
RV and marine finance 3,152 2,437
Other consumer 1,265 1,122
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 6,233 6,102
Home equity 6,173 6,352
Residential mortgage 6,841 5,697
RV and marine finance 2,007 1,433
Other consumer 471 428
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,503 4,312
Home equity 2,963 3,024
Residential mortgage 2,783 2,581
RV and marine finance 966 863
Other consumer 612 540
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,350 1,390
Home equity 650 617
Residential mortgage 622 605
RV and marine finance 101 96
Other consumer 124 143
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 289 295
Home equity 62 104
Residential mortgage 134 54
RV and marine finance 78 45
Other consumer $ 58 $ 11