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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 | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down | $ 1 | $ 2 | $ 3 | $ 3 |
Nonperforming loans | 793 |  | 793 |  | $ 797
Loans accruing and 90 days or more past due | 30 |  | 30 |  | 25
GNMA |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans sold with right to repurchase | 195 |  | 195 |  | 133
Residential mortgages |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Loans accruing and 90 days or more past due | 12 |  | 12 |  | 12
Commercial | Commercial |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 228 |  | 228 |  | 194
Loans accruing and 90 days or more past due | 1 |  | 1 |  | 1
Commercial | Commercial real estate |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 49 |  | 49 |  | 7
Loans accruing and 90 days or more past due | 0 |  | 0 |  | 0
Commercial | Leases |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 4 |  | 4 |  | 0
Loans accruing and 90 days or more past due | 1 |  | 1 |  | 0
Commercial | Commercial Banking |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 281 |  | 281 |  | 201
Loans accruing and 90 days or more past due | 2 |  | 2 |  | 1
Retail | Residential mortgages |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 147 |  | 147 |  | 136
Loans accruing and 90 days or more past due | 15 |  | 15 |  | 15
Retail | Home equity loans |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 36 |  | 36 |  | 50
Loans accruing and 90 days or more past due | 0 |  | 0 |  | 0
Retail | Home equity lines of credit |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 184 |  | 184 |  | 231
Loans accruing and 90 days or more past due | 0 |  | 0 |  | 0
Retail | Home equity loans serviced by others |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 14 |  | 14 |  | 17
Loans accruing and 90 days or more past due | 0 |  | 0 |  | 0
Retail | Home equity lines of credit serviced by others |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 13 |  | 13 |  | 15
Loans accruing and 90 days or more past due | 0 |  | 0 |  | 0
Retail | Automobile |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 69 |  | 69 |  | 81
Loans accruing and 90 days or more past due | 0 |  | 0 |  | 0
Retail | Education |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 17 |  | 17 |  | 38
Loans accruing and 90 days or more past due | 3 |  | 3 |  | 2
Retail | Credit cards |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 21 |  | 21 |  | 20
Loans accruing and 90 days or more past due | 0 |  | 0 |  | 0
Retail | Other retail |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 11 |  | 11 |  | 8
Loans accruing and 90 days or more past due | 10 |  | 10 |  | 7
Retail | Retail |  |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |  |
Nonperforming loans | 512 |  | 512 |  | 596
Loans accruing and 90 days or more past due | $ 28 |  | $ 28 |  | $ 24

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