Annual report pursuant to Section 13 and 15(d)

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

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Credit Quality Indicators (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases $ 30,605 $ 28,107
Commercial real estate loans 6,842 7,225
Automobile loans 12,429 12,100
Home equity loans 9,722 10,099
Residential mortgage loans 10,728 9,026
Other consumer loans 1,320 1,122
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 30,605 28,107
Commercial real estate loans 6,842 7,225
Commercial Portfolio Segment [Member] | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 28,807 26,268
Commercial real estate loans 6,586 6,909
Commercial Portfolio Segment [Member] | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 518 694
Commercial real estate loans 181 200
Commercial Portfolio Segment [Member] | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 1,269 1,116
Commercial real estate loans 74 115
Commercial Portfolio Segment [Member] | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 11 29
Commercial real estate loans 1 1
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 12,429 12,099
Home equity loans 9,720 10,097
Residential mortgage loans 10,650 8,937
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 3,254 2,437
Other consumer loans 1,320 1,122
Consumer | FICO Score, Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 6,254 6,102
Home equity loans 6,098 6,352
Residential mortgage loans 7,159 5,697
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 2,074 1,433
Other consumer loans 501 428
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 4,520 4,312
Home equity loans 2,975 3,024
Residential mortgage loans 2,801 2,581
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 990 863
Other consumer loans 633 540
Consumer | 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 1,373 1,390
Home equity loans 591 617
Residential mortgage loans 612 605
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 105 96
Other consumer loans 129 143
Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 282 295
Home equity loans 56 104
Residential mortgage loans 78 54
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 85 45
Other consumer loans $ 57 $ 11