Annual report pursuant to Section 13 and 15(d)

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

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, unpaid principle $ 0 $ 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, unpaid principle 0 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, unpaid principle 0 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, unpaid principle 0 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
Commercial Portfolio Segment [Member] | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 284 300
Impaired loans and leases with no related allowance, unpaid principle 311 359
Impaired loans and leases with no related allowance, average balance 206 293
Impaired loans and leases with no related allowance, interest income recognized 12 9
Impaired loans and leases with an allowance recorded, ending balance 257 406
Impaired loans and leases with an allowance recorded, unpaid principle 280 448
Impaired loans and leases with an allowance recorded, related allowance 29 22
Impaired Financing Receivable, Average Recorded Investment 498 595
Impaired loans and leases with an allowance recorded, average balance 292 302
Impaired loans and leases with an allowance recorded, interest income recognized 16 8
Considered impaired due to TDR status 382 317
Impaired Financing Receivable, Recorded Investment 541 706
Impaired Financing Receivable, Unpaid Principal Balance 591 807
Impaired Financing Receivable, Interest Income, Accrual Method 28 17
Commercial Portfolio Segment [Member] | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 56 89
Impaired loans and leases with no related allowance, unpaid principle 81 126
Impaired loans and leases with no related allowance, average balance 64 73
Impaired loans and leases with no related allowance, interest income recognized 8 4
Impaired loans and leases with an allowance recorded, ending balance 51 97
Impaired loans and leases with an allowance recorded, unpaid principle 51 108
Impaired loans and leases with an allowance recorded, related allowance 3 3
Impaired Financing Receivable, Average Recorded Investment 116 142
Impaired loans and leases with an allowance recorded, average balance 52 69
Impaired loans and leases with an allowance recorded, interest income recognized 2 3
Considered impaired due to TDR status 93 82
Impaired Financing Receivable, Recorded Investment 107 186
Impaired Financing Receivable, Unpaid Principal Balance 132 234
Impaired Financing Receivable, Interest Income, Accrual Method 10 7
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with an allowance recorded, ending balance 36 31
Impaired loans and leases with an allowance recorded, unpaid principle 40 31
Impaired loans and leases with an allowance recorded, related allowance 2 2
Impaired Financing Receivable, Average Recorded Investment 33 32
Impaired loans and leases with an allowance recorded, average balance 33 32
Impaired loans and leases with an allowance recorded, interest income recognized 2 2
Impaired Financing Receivable, Recorded Investment 36 31
Impaired Financing Receivable, Unpaid Principal Balance 40 31
Impaired Financing Receivable, Interest Income, Accrual Method 2 2
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with an allowance recorded, ending balance 334 319
Impaired loans and leases with an allowance recorded, unpaid principle 385 353
Impaired loans and leases with an allowance recorded, related allowance 14 15
Impaired Financing Receivable, Average Recorded Investment 329 278
Impaired loans and leases with an allowance recorded, average balance 329 278
Impaired loans and leases with an allowance recorded, interest income recognized 15 13
Impaired Financing Receivable, Recorded Investment 334 319
Impaired Financing Receivable, Unpaid Principal Balance 385 353
Impaired Financing Receivable, Interest Income, Accrual Method 15 13
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with an allowance recorded, ending balance 308 328
Impaired loans and leases with an allowance recorded, unpaid principle 338 363
Impaired loans and leases with an allowance recorded, related allowance 4 13
Impaired Financing Receivable, Average Recorded Investment 325 348
Impaired loans and leases with an allowance recorded, average balance 325 348
Impaired loans and leases with an allowance recorded, interest income recognized 12 12
Impaired Financing Receivable, Recorded Investment 308 328
Impaired Financing Receivable, Unpaid Principal Balance 338 363
Impaired Financing Receivable, Interest Income, Accrual Method 12 12
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with an allowance recorded, ending balance 2 0
Impaired loans and leases with an allowance recorded, unpaid principle 3 0
Impaired loans and leases with an allowance recorded, related allowance 0 0
Impaired Financing Receivable, Average Recorded Investment 1 0
Impaired loans and leases with an allowance recorded, average balance 1 0
Impaired loans and leases with an allowance recorded, interest income recognized 0 0
Impaired Financing Receivable, Recorded Investment 2 0
Impaired Financing Receivable, Unpaid Principal Balance 3 0
Impaired Financing Receivable, Interest Income, Accrual Method 0 0
Consumer | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Impaired loans and leases with no related allowance, ending balance 0 0
Impaired loans and leases with no related allowance, unpaid principle 0 0
Impaired loans and leases with no related allowance, average balance 0 0
Impaired loans and leases with no related allowance, interest income recognized 0 0
Impaired loans and leases with an allowance recorded, ending balance 8 4
Impaired loans and leases with an allowance recorded, unpaid principle 8 4
Impaired loans and leases with an allowance recorded, related allowance 2 0
Impaired Financing Receivable, Average Recorded Investment 5 4
Impaired loans and leases with an allowance recorded, average balance 5 4
Impaired loans and leases with an allowance recorded, interest income recognized 0 0
Impaired Financing Receivable, Recorded Investment 8 4
Impaired Financing Receivable, Unpaid Principal Balance 8 4
Impaired Financing Receivable, Interest Income, Accrual Method $ 0 $ 0