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 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Document Period End Date     Jun. 30, 2019    
Commercial | Commercial and Industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded $ 203   $ 203   $ 224
Unpaid principal balance of impaired loans with no allowance recorded 230   230   261
Average balance of impaired loans with no allowance recorded 205 $ 259 211 $ 268  
Interest income recognized on impaired loans with no allowance recorded 5 6 11 10  
Ending balance of impaired loans with allowance recorded 329   329   221
Unpaid principal balance of impaired loans with allowance recorded 364   364   240
Related Allowance 47   47   31
Average balance of impaired loans with allowance recorded 328 295 292 283  
Interest income recognized on impaired loans with allowance recorded 3 3 5 6  
Impaired Financing Receivable, Recorded Investment 532   532   445
Impaired Financing Receivable, Unpaid Principal Balance 594   594   501
Impaired Financing Receivable, Average Recorded Investment 533 554 503 551  
Impaired Financing Receivable, Interest Income, Accrual Method 8 9 16 16  
Loans considered impaired due to status as a TDR 333   333   366
Commercial | Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 28   28   36
Unpaid principal balance of impaired loans with no allowance recorded 32   32   45
Average balance of impaired loans with no allowance recorded 34 55 35 55  
Interest income recognized on impaired loans with no allowance recorded 2 2 4 4  
Ending balance of impaired loans with allowance recorded 34   34   35
Unpaid principal balance of impaired loans with allowance recorded 38   38   39
Related Allowance 2   2   2
Average balance of impaired loans with allowance recorded 34 46 35 48  
Interest income recognized on impaired loans with allowance recorded 0 0 1 1  
Impaired Financing Receivable, Recorded Investment 62   62   71
Impaired Financing Receivable, Unpaid Principal Balance 70   70   84
Impaired Financing Receivable, Average Recorded Investment 68 101 70 103  
Impaired Financing Receivable, Interest Income, Accrual Method 2 2 5 5  
Loans considered impaired due to status as a TDR 54   54   60
Consumer | Automobile          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 40   40   38
Unpaid principal balance of impaired loans with allowance recorded 43   43   42
Related Allowance 2   2   2
Average balance of impaired loans with allowance recorded 40 37 39 36  
Interest income recognized on impaired loans with allowance recorded 1 1 1 1  
Impaired Financing Receivable, Recorded Investment 40   40   38
Impaired Financing Receivable, Unpaid Principal Balance 43   43   42
Impaired Financing Receivable, Average Recorded Investment 40 37 39 36  
Impaired Financing Receivable, Interest Income, Accrual Method 1 1 1 1  
Consumer | Home Equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 301   301   314
Unpaid principal balance of impaired loans with allowance recorded 339   339   356
Related Allowance 11   11   10
Average balance of impaired loans with allowance recorded 306 331 309 332  
Interest income recognized on impaired loans with allowance recorded 3 4 7 7  
Impaired Financing Receivable, Recorded Investment 301   301   314
Impaired Financing Receivable, Unpaid Principal Balance 339   339   356
Impaired Financing Receivable, Average Recorded Investment 306 331 309 332  
Impaired Financing Receivable, Interest Income, Accrual Method 3 4 7 7  
Consumer | Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 284   284   287
Unpaid principal balance of impaired loans with allowance recorded 319   319   323
Related Allowance 3   3   4
Average balance of impaired loans with allowance recorded 285 300 286 303  
Interest income recognized on impaired loans with allowance recorded 3 3 6 5  
Impaired Financing Receivable, Recorded Investment 284   284   287
Impaired Financing Receivable, Unpaid Principal Balance 319   319   323
Impaired Financing Receivable, Average Recorded Investment 285 300 286 303  
Impaired Financing Receivable, Interest Income, Accrual Method 3 3 6 5  
Consumer | RV and Marine FInance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 3   3   2
Unpaid principal balance of impaired loans with allowance recorded 3   3   3
Related Allowance 0   0   0
Average balance of impaired loans with allowance recorded 3 2 3 2  
Interest income recognized on impaired loans with allowance recorded 0 0 0 0  
Impaired Financing Receivable, Recorded Investment 3   3   2
Impaired Financing Receivable, Unpaid Principal Balance 3   3   3
Impaired Financing Receivable, Average Recorded Investment 3 2 3 2  
Impaired Financing Receivable, Interest Income, Accrual Method 0 0 0 0  
Consumer | Other Consumer          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 9   9   9
Unpaid principal balance of impaired loans with allowance recorded 9   9   9
Related Allowance 2   2   3
Average balance of impaired loans with allowance recorded 9 7 9 7  
Interest income recognized on impaired loans with allowance recorded 0 0 0 0  
Impaired Financing Receivable, Recorded Investment 9   9   9
Impaired Financing Receivable, Unpaid Principal Balance 9   9   $ 9
Impaired Financing Receivable, Average Recorded Investment 9 7 9 7  
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0 $ 0 $ 0