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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Nonaccrual Loans and Leases by Class (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | $ 780 | $ 703
90 days past due and accruing | 27 |
Nonaccrual with no related ACL | 232 |
Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
90 days past due and accruing |  | 0
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 314 | 245
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 52 |
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 305 | 240
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 46 |
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 8 | 2
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 6 |
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 1 | 3
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 0 |
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 466 | 458
90 days past due and accruing | 27 |
Nonaccrual with no related ACL | 180 |
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 101 | 93
90 days past due and accruing | 14 |
Nonaccrual with no related ACL | 55 |
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 242 | 246
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 90 |
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 69 | 67
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 30 |
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 21 | 18
90 days past due and accruing | 2 |
Nonaccrual with no related ACL | 4 |
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 33 | $ 34
90 days past due and accruing | 11 |
Nonaccrual with no related ACL | $ 1 |

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- Definition Amount of financing receivable on nonaccrual status with no allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447 + Details
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