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
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Document Period End Date Jun. 30, 2019  
Commercial and industrial $ 30,608 $ 30,605
Commercial real estate 6,888 6,842
Automobile 12,173 12,429
Home equity 9,419 9,722
Residential mortgage 11,182 10,728
Other consumer 1,271 1,320
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 30,608 30,605
Commercial real estate 6,888 6,842
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 28,584 28,807
Commercial real estate 6,657 6,586
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,384 1,269
Commercial real estate 73 74
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 634 518
Commercial real estate 156 181
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 6 11
Commercial real estate 2 1
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 12,173 12,429
Home equity 9,418 9,720
Residential mortgage 11,105 10,650
RV and marine finance 3,492 3,254
Other consumer 1,271 1,320
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 6,140 6,254
Home equity 5,960 6,098
Residential mortgage 7,630 7,159
RV and marine finance 2,293 2,074
Other consumer 496 501
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,447 4,520
Home equity 2,823 2,975
Residential mortgage 2,725 2,801
RV and marine finance 992 990
Other consumer 594 633
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,315 1,373
Home equity 586 591
Residential mortgage 589 612
RV and marine finance 108 105
Other consumer 120 129
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 271 282
Home equity 49 56
Residential mortgage 161 78
RV and marine finance 99 85
Other consumer $ 61 $ 57