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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 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | $ 1,019 | $ 703
90+ days past due and accruing | 62 |
Nonaccrual with no related ACL | 380 |
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 458 | 245
90+ days past due and accruing | 21 |
Nonaccrual with no related ACL | 58 |
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 280 | 240
90+ days past due and accruing | 20 |
Nonaccrual with no related ACL | 56 |
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 176 | 2
90+ days past due and accruing | 0 |
Nonaccrual with no related ACL | 2 |
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 2 | 3
90+ days past due and accruing | 1 |
Nonaccrual with no related ACL | 0 |
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 561 | 458
90+ days past due and accruing | 41 |
Nonaccrual with no related ACL | 322 |
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 167 | 93
90+ days past due and accruing | 30 |
Nonaccrual with no related ACL | 96 |
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 276 | 246
90+ days past due and accruing | 0 |
Nonaccrual with no related ACL | 207 |
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 72 | 67
90+ days past due and accruing | 0 |
Nonaccrual with no related ACL | 17 |
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 18 | 18
90+ days past due and accruing | 2 |
Nonaccrual with no related ACL | 2 |
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 28 | $ 34
90+ days past due and accruing | 9 |
Nonaccrual with no related ACL | $ 0 |

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