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 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Automobile    
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
Home Equity    
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
Residential Mortgage    
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
RV and Marine FInance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Unpaid principal balance of impaired loans with no allowance recorded 0  
Average balance of impaired loans with no allowance recorded 0  
Interest income recognized on impaired loans with no allowance recorded 0  
Commercial | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance of impaired loans with no allowance recorded 243 284
Unpaid principal balance of impaired loans with no allowance recorded 271 311
Average balance of impaired loans with no allowance recorded 264 276
Interest income recognized on impaired loans with no allowance recorded 5 4
Ending balance of impaired loans with allowance recorded 314 257
Unpaid principal balance of impaired loans with allowance recorded 349 280
Related Allowance 34 29
Impaired Financing Receivable, Average Recorded Investment 550 610
Impaired Financing Receivable, Interest Income, Accrual Method 8 6
Average balance of impaired loans with allowance recorded 286 334
Interest income recognized on impaired loans with allowance recorded 3 2
Loans considered impaired due to status as a TDR 399 382
Impaired Financing Receivable, Recorded Investment 557 541
Impaired Financing Receivable, Unpaid Principal Balance 620 591
Commercial | Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance of impaired loans with no allowance recorded 71 56
Unpaid principal balance of impaired loans with no allowance recorded 91 81
Average balance of impaired loans with no allowance recorded   86
Interest income recognized on impaired loans with no allowance recorded   2
Ending balance of impaired loans with allowance recorded 42  
Unpaid principal balance of impaired loans with allowance recorded 48  
Related Allowance 2  
Loans considered impaired due to status as a TDR 92 93
Impaired Financing Receivable, Recorded Investment 113  
Impaired Financing Receivable, Unpaid Principal Balance 139  
Commercial | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Average balance of impaired loans with no allowance recorded 63  
Interest income recognized on impaired loans with no allowance recorded 2  
Ending balance of impaired loans with allowance recorded   51
Unpaid principal balance of impaired loans with allowance recorded   51
Related Allowance   3
Impaired Financing Receivable, Average Recorded Investment 110 155
Impaired Financing Receivable, Interest Income, Accrual Method 2 2
Average balance of impaired loans with allowance recorded 47 69
Interest income recognized on impaired loans with allowance recorded 0 0
Impaired Financing Receivable, Recorded Investment   107
Impaired Financing Receivable, Unpaid Principal Balance   132
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance of impaired loans with no allowance recorded 0 0
Ending balance of impaired loans with allowance recorded 37 36
Unpaid principal balance of impaired loans with allowance recorded 41 40
Related Allowance 2 2
Impaired Financing Receivable, Average Recorded Investment 36 32
Impaired Financing Receivable, Interest Income, Accrual Method 1 1
Average balance of impaired loans with allowance recorded 36 32
Interest income recognized on impaired loans with allowance recorded 1 1
Impaired Financing Receivable, Recorded Investment 37 36
Impaired Financing Receivable, Unpaid Principal Balance 41 40
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance of impaired loans with no allowance recorded 0 0
Ending balance of impaired loans with allowance recorded 335 334
Unpaid principal balance of impaired loans with allowance recorded 386 385
Related Allowance 14 14
Impaired Financing Receivable, Average Recorded Investment 334 323
Impaired Financing Receivable, Interest Income, Accrual Method 3 4
Average balance of impaired loans with allowance recorded 334 323
Interest income recognized on impaired loans with allowance recorded 3 4
Impaired Financing Receivable, Recorded Investment 335 334
Impaired Financing Receivable, Unpaid Principal Balance 386 385
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance of impaired loans with no allowance recorded 0 0
Ending balance of impaired loans with allowance recorded 307 308
Unpaid principal balance of impaired loans with allowance recorded 335 338
Related Allowance 4 4
Impaired Financing Receivable, Average Recorded Investment 308 339
Impaired Financing Receivable, Interest Income, Accrual Method 3 3
Average balance of impaired loans with allowance recorded 308 339
Interest income recognized on impaired loans with allowance recorded 3 3
Impaired Financing Receivable, Recorded Investment 307 308
Impaired Financing Receivable, Unpaid Principal Balance 335 338
Consumer | RV and Marine FInance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance of impaired loans with no allowance recorded 0 0
Unpaid principal balance of impaired loans with no allowance recorded   0
Average balance of impaired loans with no allowance recorded   0
Interest income recognized on impaired loans with no allowance recorded   0
Ending balance of impaired loans with allowance recorded 2 2
Unpaid principal balance of impaired loans with allowance recorded 3 3
Related Allowance 0 0
Impaired Financing Receivable, Average Recorded Investment 2 0
Impaired Financing Receivable, Interest Income, Accrual Method 0 0
Average balance of impaired loans with allowance recorded 2 0
Interest income recognized on impaired loans with allowance recorded 0 0
Impaired Financing Receivable, Recorded Investment 2 2
Impaired Financing Receivable, Unpaid Principal Balance 3 3
Consumer | Other Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance of impaired loans with no allowance recorded 0 0
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
Ending balance of impaired loans with allowance recorded 6 8
Unpaid principal balance of impaired loans with allowance recorded 6 8
Related Allowance 2 2
Impaired Financing Receivable, Average Recorded Investment 7 4
Impaired Financing Receivable, Interest Income, Accrual Method 0 0
Average balance of impaired loans with allowance recorded 7 4
Interest income recognized on impaired loans with allowance recorded 0 0
Impaired Financing Receivable, Recorded Investment 6 8
Impaired Financing Receivable, Unpaid Principal Balance $ 6 $ 8