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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 | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | $ 1,277 | $ 703
90 days past due and accruing | 28 |
Nonaccrual with no related ACL | 353 |
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 760 | 245
90 days past due and accruing | 3 |
Nonaccrual with no related ACL | 36 |
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 435 | 240
90 days past due and accruing | 3 |
Nonaccrual with no related ACL | 33 |
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 323 | 2
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 3 |
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 2 | 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 | 517 | 458
90 days past due and accruing | 25 |
Nonaccrual with no related ACL | 317 |
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 131 | 93
90 days past due and accruing | 17 |
Nonaccrual with no related ACL | 101 |
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 265 | 246
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 192 |
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 80 | 67
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 18 |
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 16 | 18
90 days past due and accruing | 2 |
Nonaccrual with no related ACL | 5 |
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 25 | $ 34
90 days past due and accruing | 6 |
Nonaccrual with no related ACL | $ 1 |

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