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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 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 $ 205   $ 205   $ 224
Unpaid principal balance of impaired loans with no allowance recorded 250   250   261
Average balance of impaired loans with no allowance recorded 204 $ 264 210 $ 264  
Interest income recognized on impaired loans with no allowance recorded 4 5 16 16  
Ending balance of impaired loans with allowance recorded 314   314   221
Unpaid principal balance of impaired loans with allowance recorded 344   344   240
Related Allowance 43   43   31
Average balance of impaired loans with allowance recorded 322 284 298 285  
Interest income recognized on impaired loans with allowance recorded 3 3 8 9  
Impaired Financing Receivable, Recorded Investment 519   519   445
Impaired Financing Receivable, Unpaid Principal Balance 594   594   501
Impaired Financing Receivable, Average Recorded Investment 526 548 508 549  
Impaired Financing Receivable, Interest Income, Accrual Method 7 8 24 25  
Loans considered impaired due to status as a TDR 309   309   366
Commercial | Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 31   31   36
Unpaid principal balance of impaired loans with no allowance recorded 33   33   45
Average balance of impaired loans with no allowance recorded 30 36 34 49  
Interest income recognized on impaired loans with no allowance recorded 2 2 6 6  
Ending balance of impaired loans with allowance recorded 24   24   35
Unpaid principal balance of impaired loans with allowance recorded 27   27   39
Related Allowance 2   2   2
Average balance of impaired loans with allowance recorded 29 49 32 48  
Interest income recognized on impaired loans with allowance recorded 0 1 1 2  
Impaired Financing Receivable, Recorded Investment 55   55   71
Impaired Financing Receivable, Unpaid Principal Balance 60   60   84
Impaired Financing Receivable, Average Recorded Investment 59 85 66 97  
Impaired Financing Receivable, Interest Income, Accrual Method 2 3 7 8  
Loans considered impaired due to status as a TDR 46   46   60
Consumer | Automobile          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 42   42   38
Unpaid principal balance of impaired loans with allowance recorded 45   45   42
Related Allowance 2   2   2
Average balance of impaired loans with allowance recorded 41 38 40 37  
Interest income recognized on impaired loans with allowance recorded 1 1 2 2  
Impaired Financing Receivable, Recorded Investment 42   42   38
Impaired Financing Receivable, Unpaid Principal Balance 45   45   42
Impaired Financing Receivable, Average Recorded Investment 41 38 40 37  
Impaired Financing Receivable, Interest Income, Accrual Method 1 1 2 2  
Consumer | Home Equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 292   292   314
Unpaid principal balance of impaired loans with allowance recorded 329   329   356
Related Allowance 9   9   10
Average balance of impaired loans with allowance recorded 297 326 305 330  
Interest income recognized on impaired loans with allowance recorded 3 3 10 11  
Impaired Financing Receivable, Recorded Investment 292   292   314
Impaired Financing Receivable, Unpaid Principal Balance 329   329   356
Impaired Financing Receivable, Average Recorded Investment 297 326 305 330  
Impaired Financing Receivable, Interest Income, Accrual Method 3 3 10 11  
Consumer | Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 290   290   287
Unpaid principal balance of impaired loans with allowance recorded 326   326   323
Related Allowance 3   3   4
Average balance of impaired loans with allowance recorded 287 290 287 299  
Interest income recognized on impaired loans with allowance recorded 3 3 8 8  
Impaired Financing Receivable, Recorded Investment 290   290   287
Impaired Financing Receivable, Unpaid Principal Balance 326   326   323
Impaired Financing Receivable, Average Recorded Investment 287 290 287 299  
Impaired Financing Receivable, Interest Income, Accrual Method 3 3 8 8  
Consumer | RV and Marine FInance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with allowance recorded 4   4   2
Unpaid principal balance of impaired loans with allowance recorded 4   4   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 4   4   2
Impaired Financing Receivable, Unpaid Principal Balance 4   4   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 10   10   9
Unpaid principal balance of impaired loans with allowance recorded 10   10   9
Related Allowance 2   2   3
Average balance of impaired loans with allowance recorded 10 9 9 8  
Interest income recognized on impaired loans with allowance recorded 0 0 0 0  
Impaired Financing Receivable, Recorded Investment 10   10   9
Impaired Financing Receivable, Unpaid Principal Balance 10   10   $ 9
Impaired Financing Receivable, Average Recorded Investment 10 9 9 8  
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0 $ 0 $ 0