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, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial $ 28,622 $ 28,107
Commercial real estate 7,412 7,225
Automobile 12,146 12,100
Home equity 9,987 10,099
Residential mortgage 9,357 9,026
Other consumer 1,090 1,122
Commercial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 28,622 28,107
Commercial real estate 7,412 7,225
Commercial | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 26,719 26,268
Commercial real estate 7,049 6,909
Commercial | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 1,142 1,116
Commercial real estate 139 115
Commercial | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 747 694
Commercial real estate 222 200
Commercial | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial 14 29
Commercial real estate 2 1
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 12,145 12,099
Home equity 9,985 10,097
Residential mortgage 9,275 8,937
RV and marine finance 2,548 2,437
Other consumer 1,090 1,122
Consumer | Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 6,114 6,102
Home equity 6,247 6,352
Residential mortgage 5,976 5,697
RV and marine finance 1,529 1,433
Other consumer 408 428
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 4,338 4,312
Home equity 3,025 3,024
Residential mortgage 2,591 2,581
RV and marine finance 866 863
Other consumer 549 540
Consumer | Less Than 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 1,395 1,390
Home equity 631 617
Residential mortgage 621 605
RV and marine finance 104 96
Other consumer 96 143
Consumer | Other FICO score    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile 298 295
Home equity 82 104
Residential mortgage 87 54
RV and marine finance 49 45
Other consumer $ 37 $ 11