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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Nonperforming Loans and Leases by Class (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | $ 703 | $ 766
Loans accruing and 90 days or more past due | 25 | 25
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 245 | 201
Loans accruing and 90 days or more past due | 2 | 1
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 240 | 194
Loans accruing and 90 days or more past due | 2 | 1
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 2 | 7
Loans accruing and 90 days or more past due | 0 | 0
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 3 | 0
Loans accruing and 90 days or more past due | 0 | 0
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 458 | 565
Loans accruing and 90 days or more past due | 23 | 24
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 93 | 105
Loans accruing and 90 days or more past due | 13 | 15
Retail | Home equity loans |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 33 | 50
Loans accruing and 90 days or more past due | 0 | 0
Retail | Home equity lines of credit |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 187 | 231
Loans accruing and 90 days or more past due | 0 | 0
Retail | Home equity loans serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 14 | 17
Loans accruing and 90 days or more past due | 0 | 0
Retail | Home equity lines of credit serviced by others |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 12 | 15
Loans accruing and 90 days or more past due | 0 | 0
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 67 | 81
Loans accruing and 90 days or more past due | 0 | 0
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 18 | 38
Loans accruing and 90 days or more past due | 2 | 2
Retail | Credit cards |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 22 | 20
Loans accruing and 90 days or more past due | 0 | 0
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonperforming loans | 12 | 8
Loans accruing and 90 days or more past due | $ 8 | $ 7

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