Quarterly report pursuant to Section 13 or 15(d)

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

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LOANS / LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Commercial | Commercial and Industrial      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with no allowance recorded $ 207   $ 224
Unpaid principal balance of impaired loans with no allowance recorded 235   261
Average balance of impaired loans with no allowance recorded 215 $ 264  
Interest income recognized on impaired loans with no allowance recorded 6 5  
Ending balance of impaired loans with allowance recorded 328   221
Unpaid principal balance of impaired loans with allowance recorded 362   240
Related Allowance 48   31
Average balance of impaired loans with allowance recorded 274 286  
Interest income recognized on impaired loans with allowance recorded 2 3  
Impaired Financing Receivable, Recorded Investment 535   445
Impaired Financing Receivable, Unpaid Principal Balance 597   501
Impaired Financing Receivable, Average Recorded Investment 489 550  
Impaired Financing Receivable, Interest Income, Accrual Method 8 8  
Loans considered impaired due to status as a TDR 356   366
Commercial | Real Estate      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with no allowance recorded 40   36
Unpaid principal balance of impaired loans with no allowance recorded 44   45
Average balance of impaired loans with no allowance recorded 38 63  
Interest income recognized on impaired loans with no allowance recorded 2 2  
Ending balance of impaired loans with allowance recorded 35   35
Unpaid principal balance of impaired loans with allowance recorded 40   39
Related Allowance 2   2
Average balance of impaired loans with allowance recorded 35 47  
Interest income recognized on impaired loans with allowance recorded 0 0  
Impaired Financing Receivable, Recorded Investment 75   71
Impaired Financing Receivable, Unpaid Principal Balance 84   84
Impaired Financing Receivable, Average Recorded Investment 73 110  
Impaired Financing Receivable, Interest Income, Accrual Method 2 2  
Loans considered impaired due to status as a TDR 66   60
Consumer | Automobile      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with allowance recorded 40   38
Unpaid principal balance of impaired loans with allowance recorded 43   42
Related Allowance 2   2
Average balance of impaired loans with allowance recorded 39 36  
Interest income recognized on impaired loans with allowance recorded 1 1  
Impaired Financing Receivable, Recorded Investment 40   38
Impaired Financing Receivable, Unpaid Principal Balance 43   42
Impaired Financing Receivable, Average Recorded Investment 39 36  
Impaired Financing Receivable, Interest Income, Accrual Method 1 1  
Consumer | Home Equity      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with allowance recorded 311   314
Unpaid principal balance of impaired loans with allowance recorded 351   356
Related Allowance 11   10
Average balance of impaired loans with allowance recorded 313 334  
Interest income recognized on impaired loans with allowance recorded 3 3  
Impaired Financing Receivable, Recorded Investment 311   314
Impaired Financing Receivable, Unpaid Principal Balance 351   356
Impaired Financing Receivable, Average Recorded Investment 313 334  
Impaired Financing Receivable, Interest Income, Accrual Method 3 3  
Consumer | Residential Mortgage      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with allowance recorded 287   287
Unpaid principal balance of impaired loans with allowance recorded 322   323
Related Allowance 4   4
Average balance of impaired loans with allowance recorded 287 308  
Interest income recognized on impaired loans with allowance recorded 3 3  
Impaired Financing Receivable, Recorded Investment 287   287
Impaired Financing Receivable, Unpaid Principal Balance 322   323
Impaired Financing Receivable, Average Recorded Investment 287 308  
Impaired Financing Receivable, Interest Income, Accrual Method 3 3  
Consumer | RV and Marine FInance      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with allowance recorded 3   2
Unpaid principal balance of impaired loans with allowance recorded 3   3
Related Allowance 0   0
Average balance of impaired loans with allowance recorded 2 2  
Interest income recognized on impaired loans with allowance recorded 0 0  
Impaired Financing Receivable, Recorded Investment 3   2
Impaired Financing Receivable, Unpaid Principal Balance 3   3
Impaired Financing Receivable, Average Recorded Investment 2 2  
Impaired Financing Receivable, Interest Income, Accrual Method 0 0  
Consumer | Other Consumer      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Ending balance of impaired loans with allowance recorded 9   9
Unpaid principal balance of impaired loans with allowance recorded 9   9
Related Allowance 2   3
Average balance of impaired loans with allowance recorded 9 7  
Interest income recognized on impaired loans with allowance recorded 0 0  
Impaired Financing Receivable, Recorded Investment 9   9
Impaired Financing Receivable, Unpaid Principal Balance 9   $ 9
Impaired Financing Receivable, Average Recorded Investment 9 7  
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0