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, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Nonaccrual $ 468 $ 340
Loans and leases, past due 788 774
Loans and leases, current 74,535 74,047
Loans and Leases Receivable, Gross 75,404 74,900
90 or more days past due and accruing 171 170
Consumer loans 81 79
30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 342 362
60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 129 114
90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 317 298
Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, current 30,499 30,465
Loans and Leases Receivable, Gross 30,664 30,605
90 or more days past due and accruing 11 7
Consumer loans 0 0
Commercial and Industrial | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 65 72
Commercial and Industrial | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 31 17
Commercial and Industrial | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 69 51
Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, current 6,663 6,827
Loans and Leases Receivable, Gross 6,674 6,842
90 or more days past due and accruing 0 0
Consumer loans 0 0
Commercial Real Estate | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 3 10
Commercial Real Estate | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 1 0
Commercial Real Estate | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 7 5
Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, current 12,672 12,305
Loans and Leases Receivable, Gross 12,797 12,429
90 or more days past due and accruing 8 8
Consumer loans 0 0
Automobile | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 95 95
Automobile | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 19 19
Automobile | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 11 10
Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, current 8,972 9,593
Loans and Leases Receivable, Gross 9,093 9,722
90 or more days past due and accruing 14 17
Consumer loans 1 1
Home Equity | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 50 51
Home Equity | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 19 21
Home Equity | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 51 56
Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, current 10,974 10,327
Loans and Leases Receivable, Gross 11,376 10,728
90 or more days past due and accruing 129 131
Consumer loans 80 78
Residential Mortgage | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 103 108
Residential Mortgage | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 49 47
Residential Mortgage | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 170 168
RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, current 3,544 3,237
Loans and Leases Receivable, Gross 3,563 3,254
90 or more days past due and accruing 2 1
Consumer loans 0 0
RV and marine finance | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 13 12
RV and marine finance | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 4 3
RV and marine finance | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 2 2
Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, current 1,211 1,293
Loans and Leases Receivable, Gross 1,237 1,320
90 or more days past due and accruing 7 6
Consumer loans 0 0
Consumer | 30-59 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 13 14
Consumer | 60-89 Days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 6 7
Consumer | 90 or more days    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases, past due 7 6
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 30,664 30,605
Commercial Portfolio Segment [Member] | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Nonaccrual 323 188
Loans and leases, past due 165 140
Commercial Portfolio Segment [Member] | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Nonaccrual 10 15
Loans and leases, past due 11 15
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Nonaccrual 4 5
Loans and leases, past due 125 124
Loans and Leases Receivable, Gross 12,797 12,429
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Nonaccrual 59 62
Loans and leases, past due 120 128
Loans and Leases Receivable, Gross 9,092 9,720
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Nonaccrual 71 69
Loans and leases, past due 322 323
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Nonaccrual 1 1
Loans and leases, past due 19 17
Loans and Leases Receivable, Gross 3,563 3,254
Consumer | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Nonaccrual 0 0
Loans and leases, past due 26 $ 27
Loans and Leases Receivable, Gross $ 1,237