Annual report pursuant to Section 13 and 15(d)

LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - TDRs (Details)

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LOANS AND LEASES AND ALLOWANCE FOR CREDIT LOSSES - TDRs (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
contract
Dec. 31, 2017
USD ($)
contract
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 6,391 6,745
Post-modification Outstanding Balance (2) $ 539 $ 853
Financial effects of modification 15 13
Amount of security for borrowing and advances 46,500 31,700
Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 8 3
Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 508 817
Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 23 27
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 6
Commercial Portfolio Segment [Member] | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 725 1,047
Post-modification Outstanding Balance (2) $ 352 $ 601
Commercial Portfolio Segment [Member] | Commercial and Industrial | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 1
Commercial Portfolio Segment [Member] | Commercial and Industrial | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 352 600
Commercial Portfolio Segment [Member] | Commercial and Industrial | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
Commercial Portfolio Segment [Member] | Commercial and Industrial | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 0
Commercial Portfolio Segment [Member] | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 102 111
Post-modification Outstanding Balance (2) $ 82 $ 122
Commercial Portfolio Segment [Member] | Commercial Real Estate | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
Commercial Portfolio Segment [Member] | Commercial Real Estate | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 82 122
Commercial Portfolio Segment [Member] | Commercial Real Estate | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
Commercial Portfolio Segment [Member] | Commercial Real Estate | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 0
Consumer | Automobile    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 2,867 2,741
Post-modification Outstanding Balance (2) $ 23 $ 23
Consumer | Automobile | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
Consumer | Automobile | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 15 15
Consumer | Automobile | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 8 8
Consumer | Automobile | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 0
Consumer | Home Equity    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 602 922
Post-modification Outstanding Balance (2) $ 36 $ 50
Consumer | Home Equity | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 2
Consumer | Home Equity | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 25 33
Consumer | Home Equity | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 11 11
Consumer | Home Equity | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 4
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 345 453
Post-modification Outstanding Balance (2) $ 37 $ 49
Consumer | Residential Mortgage | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
Consumer | Residential Mortgage | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 34 40
Consumer | Residential Mortgage | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 3 7
Consumer | Residential Mortgage | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 2
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 117 131
Post-modification Outstanding Balance (2) $ 1 $ 2
Consumer | RV and marine finance | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
Consumer | RV and marine finance | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 1
Consumer | RV and marine finance | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 1 1
Consumer | RV and marine finance | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 0
Consumer | Consumer    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 1,633 1,340
Post-modification Outstanding Balance (2) $ 8 $ 6
Consumer | Consumer | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 8 0
Consumer | Consumer | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 6
Consumer | Consumer | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
Consumer | Consumer | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 0