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, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases $ 28,107 $ 28,059
Commercial real estate loans 7,225 7,301
Automobile loans 12,100 10,969
Home equity loans 10,099 10,106
Residential mortgage loans 9,026 7,725
Other consumer loans 1,122 956
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 28,107 28,059
Commercial real estate loans 7,225 7,301
Commercial Portfolio Segment [Member] | Pass    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 26,268 26,212
Commercial real estate loans 6,909 7,042
Commercial Portfolio Segment [Member] | OLEM    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 694 810
Commercial real estate loans 200 97
Commercial Portfolio Segment [Member] | Substandard    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 1,116 1,029
Commercial real estate loans 115 159
Commercial Portfolio Segment [Member] | Doubtful    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial and industrial loans and leases 29 8
Commercial real estate loans 1 3
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 12,099 10,967
Home equity loans 10,097 10,103
Residential mortgage loans 8,937 7,650
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 2,437 1,845
Other consumer loans 1,122 956
Consumer | FICO Score, Greater than 750    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 6,102 5,369
Home equity loans 6,352 6,280
Residential mortgage loans 5,697 4,663
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 1,433 1,064
Other consumer loans 428 347
Consumer | 650-749    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 4,312 4,044
Home equity loans 3,024 2,891
Residential mortgage loans 2,581 2,285
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 863 644
Other consumer loans 540 456
Consumer | 650    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 1,390 1,298
Home equity loans 617 638
Residential mortgage loans 605 615
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 96 73
Other consumer loans 143 133
Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Automobile loans 295 256
Home equity loans 104 294
Residential mortgage loans 54 87
Loans and Leases Receivable, Gross, Consumer, Recreation Finance 45 64
Other consumer loans $ 11 $ 20