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, 2019
USD ($)
contract
Dec. 31, 2018
USD ($)
contract
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 5,229 6,391
Post-modification Outstanding Balance (2) $ 283 $ 539
Financial effects of modification (2) (15)
Amount of security for borrowing and advances 39,600 46,500
Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 8 8
Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 249 508
Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 19 23
Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 7 $ 0
Commercial Portfolio Segment [Member] | Commercial and Industrial    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 482 725
Post-modification Outstanding Balance (2) $ 179 $ 352
Commercial Portfolio Segment [Member] | Commercial and Industrial | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
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) 172 352
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) $ 7 $ 0
Commercial Portfolio Segment [Member] | Commercial Real Estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 29 102
Post-modification Outstanding Balance (2) $ 13 $ 82
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) 13 82
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 2,971 2,867
Post-modification Outstanding Balance (2) $ 26 $ 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) 19 15
Consumer | Automobile | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 7 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 306 602
Post-modification Outstanding Balance (2) $ 17 $ 36
Consumer | Home Equity | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
Consumer | Home Equity | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 9 25
Consumer | Home Equity | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 8 11
Consumer | Home Equity | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 0
Consumer | Residential Mortgage    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 330 345
Post-modification Outstanding Balance (2) $ 37 $ 37
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) 35 34
Consumer | Residential Mortgage | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 2 3
Consumer | Residential Mortgage | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) $ 0 $ 0
Consumer | RV and marine finance    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Contracts | contract 139 117
Post-modification Outstanding Balance (2) $ 3 $ 1
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) 1 0
Consumer | RV and marine finance | Chapter 7 bankruptcy    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 2 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 972 1,633
Post-modification Outstanding Balance (2) $ 8 $ 8
Consumer | Consumer | Interest rate reduction    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 8 8
Consumer | Consumer | Amortization or maturity date change    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Post-modification Outstanding Balance (2) 0 0
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