Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - NALs Past Due (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - NALs Past Due (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due $ 774 $ 714
Loans and leases, current 74,047 69,269
Loans and Leases Receivable, Gross 74,900 70,117
90 or more days past due and accruing 170 115
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   41
Consumer loans 79 93
30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 362 335
60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 114 108
90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 298 271
Commercial Portfolio Segment [Member] | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 140 114
Loans and leases, current 30,465 27,954
Loans and Leases Receivable, Gross 30,605 28,107
90 or more days past due and accruing 7 9
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   39
Consumer loans 0 0
Commercial Portfolio Segment [Member] | Commercial and Industrial | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 72 35
Commercial Portfolio Segment [Member] | Commercial and Industrial | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 17 14
Commercial Portfolio Segment [Member] | Commercial and Industrial | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 51 65
Commercial Portfolio Segment [Member] | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 15 22
Loans and leases, current 6,827 7,201
Loans and Leases Receivable, Gross 6,842 7,225
90 or more days past due and accruing 0 3
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   2
Consumer loans 0 0
Commercial Portfolio Segment [Member] | Commercial Real Estate | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 10 10
Commercial Portfolio Segment [Member] | Commercial Real Estate | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 0 1
Commercial Portfolio Segment [Member] | Commercial Real Estate | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 5 11
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 124 117
Loans and leases, current 12,305 11,982
Loans and Leases Receivable, Gross 12,429 12,100
90 or more days past due and accruing 8 7
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   0
Consumer loans 0 1
Consumer | Automobile | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 95 89
Consumer | Automobile | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 19 18
Consumer | Automobile | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 10 10
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 128 128
Loans and leases, current 9,593 9,969
Loans and Leases Receivable, Gross 9,722 10,099
90 or more days past due and accruing 17 18
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   0
Consumer loans 1 2
Consumer | Home Equity | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 51 49
Consumer | Home Equity | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 21 19
Consumer | Home Equity | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 56 60
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 323 295
Loans and leases, current 10,327 8,642
Loans and Leases Receivable, Gross 10,728 9,026
90 or more days past due and accruing 131 72
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   0
Consumer loans 78 89
Consumer | Residential Mortgage | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 108 129
Consumer | Residential Mortgage | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 47 48
Consumer | Residential Mortgage | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 168 118
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 17 16
Loans and leases, current 3,237 2,421
Loans and Leases Receivable, Gross 3,254 2,438
90 or more days past due and accruing 1 1
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   0
Consumer loans 0 1
Consumer | RV and marine finance | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 12 11
Consumer | RV and marine finance | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 3 3
Consumer | RV and marine finance | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 2 2
Consumer | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 27 22
Loans and leases, current 1,293 1,100
Loans and Leases Receivable, Gross 1,320 1,122
90 or more days past due and accruing 6 5
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net   0
Consumer loans 0 0
Consumer | Consumer | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 14 12
Consumer | Consumer | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 7 5
Consumer | Consumer | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due $ 6 $ 5