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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Automobile          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unpaid principal balance of impaired loans with no allowance recorded $ 0   $ 0   $ 0
Average balance of impaired loans with no allowance recorded 0 $ 0 0 $ 0  
Interest income recognized on impaired loans with no allowance recorded 0 0 0 0  
Home Equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unpaid principal balance of impaired loans with no allowance recorded 0   0   0
Average balance of impaired loans with no allowance recorded 0 0 0 0  
Interest income recognized on impaired loans with no allowance recorded 0 0 0 0  
Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unpaid principal balance of impaired loans with no allowance recorded 0   0   0
Average balance of impaired loans with no allowance recorded 0 0 0 0  
Interest income recognized on impaired loans with no allowance recorded 0 0 0 0  
RV and Marine FInance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Unpaid principal balance of impaired loans with no allowance recorded 0   0    
Average balance of impaired loans with no allowance recorded 0   0    
Interest income recognized on impaired loans with no allowance recorded 0   0    
Commercial | Commercial and Industrial          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 252   252   284
Unpaid principal balance of impaired loans with no allowance recorded 289   289   311
Average balance of impaired loans with no allowance recorded 264 295 264 228  
Interest income recognized on impaired loans with no allowance recorded 5 5 16 7  
Ending balance of impaired loans with allowance recorded 291   291   257
Unpaid principal balance of impaired loans with allowance recorded 318   318   280
Related Allowance 43   43   29
Average balance of impaired loans with allowance recorded 284 223 285 334  
Interest income recognized on impaired loans with allowance recorded 3 2 9 13  
Impaired Financing Receivable, Recorded Investment 543   543   541
Impaired Financing Receivable, Unpaid Principal Balance 607   607   591
Impaired Financing Receivable, Average Recorded Investment 548 518 549 562  
Impaired Financing Receivable, Interest Income, Accrual Method 8 7 25 20  
Loans considered impaired due to status as a TDR 408   408   382
Commercial | Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 33   33   56
Unpaid principal balance of impaired loans with no allowance recorded 44   44   81
Average balance of impaired loans with no allowance recorded   71   80  
Interest income recognized on impaired loans with no allowance recorded   2   6  
Ending balance of impaired loans with allowance recorded 47   47    
Unpaid principal balance of impaired loans with allowance recorded 52   52    
Related Allowance 3   3    
Impaired Financing Receivable, Recorded Investment 80   80    
Impaired Financing Receivable, Unpaid Principal Balance 96   96    
Loans considered impaired due to status as a TDR 68   68   93
Commercial | Commercial Real Estate          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Average balance of impaired loans with no allowance recorded 36   49    
Interest income recognized on impaired loans with no allowance recorded 2   6    
Ending balance of impaired loans with allowance recorded         51
Unpaid principal balance of impaired loans with allowance recorded         51
Related Allowance         3
Average balance of impaired loans with allowance recorded 49 41 48 54  
Interest income recognized on impaired loans with allowance recorded 1 0 2 1  
Impaired Financing Receivable, Recorded Investment         107
Impaired Financing Receivable, Unpaid Principal Balance         132
Impaired Financing Receivable, Average Recorded Investment 85 112 97 134  
Impaired Financing Receivable, Interest Income, Accrual Method 3 2 8 7  
Consumer | Automobile          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Ending balance of impaired loans with allowance recorded 39   39   36
Unpaid principal balance of impaired loans with allowance recorded 43   43   40
Related Allowance 2   2   2
Average balance of impaired loans with allowance recorded 38 33 37 32  
Interest income recognized on impaired loans with allowance recorded 1 0 2 2  
Impaired Financing Receivable, Recorded Investment 39   39   36
Impaired Financing Receivable, Unpaid Principal Balance 43   43   40
Impaired Financing Receivable, Average Recorded Investment 38 33 37 32  
Impaired Financing Receivable, Interest Income, Accrual Method 1 0 2 2  
Consumer | Home Equity          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Ending balance of impaired loans with allowance recorded 325   325   334
Unpaid principal balance of impaired loans with allowance recorded 370   370   385
Related Allowance 6   6   14
Average balance of impaired loans with allowance recorded 326 331 330 327  
Interest income recognized on impaired loans with allowance recorded 3 4 11 12  
Impaired Financing Receivable, Recorded Investment 325   325   334
Impaired Financing Receivable, Unpaid Principal Balance 370   370   385
Impaired Financing Receivable, Average Recorded Investment 326 331 330 327  
Impaired Financing Receivable, Interest Income, Accrual Method 3 4 11 12  
Consumer | Residential Mortgage          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Ending balance of impaired loans with allowance recorded 286   286   308
Unpaid principal balance of impaired loans with allowance recorded 322   322   338
Related Allowance 4   4   4
Average balance of impaired loans with allowance recorded 290 320 299 329  
Interest income recognized on impaired loans with allowance recorded 3 3 8 9  
Impaired Financing Receivable, Recorded Investment 286   286   308
Impaired Financing Receivable, Unpaid Principal Balance 322   322   338
Impaired Financing Receivable, Average Recorded Investment 290 320 299 329  
Impaired Financing Receivable, Interest Income, Accrual Method 3 3 8 9  
Consumer | RV and Marine FInance          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Ending balance of impaired loans with no allowance recorded 0   0   0
Unpaid principal balance of impaired loans with no allowance recorded         0
Average balance of impaired loans with no allowance recorded   0   0  
Interest income recognized on impaired loans with no allowance recorded   0   0  
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 2 1 2 1  
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 2 1 2 1  
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 no allowance recorded 0   0   0
Unpaid principal balance of impaired loans with no allowance recorded 0   0   0
Average balance of impaired loans with no allowance recorded 0 0 0 0  
Interest income recognized on impaired loans with no allowance recorded 0 0 0 0  
Ending balance of impaired loans with allowance recorded 8   8   8
Unpaid principal balance of impaired loans with allowance recorded 8   8   8
Related Allowance 3   3   2
Average balance of impaired loans with allowance recorded 9 7 8 7  
Interest income recognized on impaired loans with allowance recorded 0 0 0 0  
Impaired Financing Receivable, Recorded Investment 8   8   8
Impaired Financing Receivable, Unpaid Principal Balance 8   8   $ 8
Impaired Financing Receivable, Average Recorded Investment 9 7 8 7  
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0 $ 0 $ 0