Quarterly report pursuant to Section 13 or 15(d)

LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - TDRs (Details)

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - TDRs (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
contract
Sep. 30, 2017
USD ($)
contract
Sep. 30, 2018
USD ($)
contract
Sep. 30, 2017
USD ($)
contract
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Number of Contracts | contract 1,649 2,203 4,993 4,809
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 69 $ 195 $ 465 $ 597
New Troubled Debt Restructuring, Financial effects of modification 1 1 11 11
Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 2 1 6 2
Amortization or maturity date change        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 60 185 442 566
Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 7 9 17 22
Other        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0 $ 0 $ 7
Commercial | Commercial and Industrial        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Number of Contracts | contract 131 277 641 747
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 35 $ 139 $ 302 $ 420
New Troubled Debt Restructuring, Financial effects of modification 0 1 7 9
Commercial | Commercial | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 1 0 1
Commercial | Commercial | Amortization or maturity date change        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 35 138 302 419
Commercial | Commercial | Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 0
Commercial | Commercial | Other        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0 $ 0 $ 0
Commercial | Commercial Real Estate        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Number of Contracts | contract 9 28 95 71
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 5 $ 18 $ 79 $ 74
New Troubled Debt Restructuring, Financial effects of modification 0 0 1 1
Commercial | Commercial Real Estate | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 0
Commercial | Commercial Real Estate | Amortization or maturity date change        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 5 18 79 74
Commercial | Commercial Real Estate | Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 0
Commercial | Commercial Real Estate | Other        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0 $ 0 $ 0
Consumer | Automobile        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Number of Contracts | contract 848 797 2,088 2,065
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 7 $ 7 $ 17 $ 17
New Troubled Debt Restructuring, Financial effects of modification 0 0 0 (1)
Consumer | Automobile | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 0
Consumer | Automobile | Amortization or maturity date change        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 4 4 11 11
Consumer | Automobile | Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 3 3 6 6
Consumer | Automobile | Other        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0 $ 0 $ 0
Consumer | Home Equity        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Number of Contracts | contract 159 247 472 739
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 11 $ 15 $ 29 $ 40
New Troubled Debt Restructuring, Financial effects of modification 1 0 2 1
Consumer | Home Equity | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 1
Consumer | Home Equity | Amortization or maturity date change        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 8 12 21 26
Consumer | Home Equity | Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 3 3 8 9
Consumer | Home Equity | Other        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0 $ 0 $ 4
Consumer | Residential Mortgage        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Number of Contracts | contract 76 123 278 375
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 9 $ 13 $ 31 $ 40
New Troubled Debt Restructuring, Financial effects of modification 0 0 1 1
Consumer | Residential Mortgage | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 0
Consumer | Residential Mortgage | Amortization or maturity date change        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 8 11 29 31
Consumer | Residential Mortgage | Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 1 2 2 6
Consumer | Residential Mortgage | Other        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0 $ 0 $ 3
Consumer | RV and Marine FInance        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Number of Contracts | contract 40 32 99 105
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 1 $ 1 $ 2
New Troubled Debt Restructuring, Financial effects of modification 0 0 0 0
Consumer | RV and Marine FInance | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 0
Consumer | RV and Marine FInance | Amortization or maturity date change        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 1
Consumer | RV and Marine FInance | Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 1 1 1
Consumer | RV and Marine FInance | Other        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0 $ 0 $ 0
Consumer | Other Consumer        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Number of Contracts | contract 386 699 1,320 707
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 2 $ 2 $ 6 $ 4
New Troubled Debt Restructuring, Financial effects of modification 0 0 0 0
Consumer | Other Consumer | Interest rate reduction        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 2 0 6 0
Consumer | Other Consumer | Amortization or maturity date change        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 2 0 4
Consumer | Other Consumer | Chapter 7 bankruptcy        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0 0 0
Consumer | Other Consumer | Other        
Financing Receivable, Modifications [Line Items]        
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0 $ 0 $ 0