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
Mar. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 30,972 $ 30,605
Commercial real estate 6,795 6,842
Automobile 12,272 12,429
Home equity 9,551 9,722
Residential mortgage 10,885 10,728
Other consumer 1,260 1,320
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 30,972 30,605
Commercial real estate 6,795 6,842
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 29,038 28,807
Commercial real estate 6,513 6,586
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,365 1,269
Commercial real estate 73 74
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 563 518
Commercial real estate 207 181
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 12,272 12,429
Home equity 9,549 9,720
Residential mortgage 10,808 10,650
RV and marine finance 3,344 3,254
Other consumer 1,260 1,320
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 6,111 6,254
Home equity 5,977 6,098
Residential mortgage 7,293 7,159
RV and marine finance 2,138 2,074
Other consumer 472 501
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,491 4,520
Home equity 2,915 2,975
Residential mortgage 2,782 2,801
RV and marine finance 1,005 990
Other consumer 607 633
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,388 1,373
Home equity 604 591
Residential mortgage 606 612
RV and marine finance 112 105
Other consumer 134 129
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 282 282
Home equity 53 56
Residential mortgage 127 78
RV and marine finance 89 85
Other consumer $ 47 $ 57