Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - TDRs (Details)
$ in Millions
 3 Months Ended
Mar. 31, 2019
USD ($)
contract
Mar. 31, 2018
USD ($)
contract
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Number of Contracts | contract 1,327 1,603
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 66 $ 153
New Troubled Debt Restructuring, Financial effects of modification 3 3
Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 1 2
Amortization or maturity date change    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 60 146
Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 5 5
Other    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0
Commercial | Commercial and Industrial    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Number of Contracts | contract 115 241
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 35 $ 96
Commercial | Commercial and Industrial | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0
Commercial | Commercial and Industrial | Amortization or maturity date change    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 35 96
Commercial | Commercial and Industrial | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0
Commercial | Commercial and Industrial | Other    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0
Commercial | Commercial Real Estate    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Number of Contracts | contract 8 48
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 9 $ 32
Commercial | Commercial Real Estate | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 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 9 32
Commercial | Commercial Real Estate | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0
Commercial | Commercial Real Estate | Other    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0
Consumer | Automobile    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Number of Contracts | contract 744 627
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 7 $ 6
Consumer | Automobile | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0
Consumer | Automobile | Amortization or maturity date change    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 5 4
Consumer | Automobile | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 2 2
Consumer | Automobile | Other    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0
Consumer | Home Equity    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Number of Contracts | contract 104 144
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 5 $ 8
Consumer | Home Equity | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0
Consumer | Home Equity | Amortization or maturity date change    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 3 5
Consumer | Home Equity | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 2 3
Consumer | Home Equity | Other    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0
Consumer | Residential Mortgage    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Number of Contracts | contract 76 83
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 8 $ 9
Consumer | Residential Mortgage | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 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 9
Consumer | Residential Mortgage | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0
Consumer | Residential Mortgage | Other    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0
Consumer | RV and Marine FInance    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Number of Contracts | contract 36 19
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 1 $ 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
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
Consumer | RV and Marine FInance | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 1 0
Consumer | RV and Marine FInance | Other    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0
Consumer | Other Consumer    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Number of Contracts | contract 244 441
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 1 $ 2
Consumer | Other Consumer | Interest rate reduction    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 1 2
Consumer | Other Consumer | Amortization or maturity date change    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0
Consumer | Other Consumer | Chapter 7 bankruptcy    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance 0 0
Consumer | Other Consumer | Other    
Financing Receivable, Modifications [Line Items]    
New Troubled Debt Restructuring, Post-modification Outstanding Ending Balance $ 0 $ 0