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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 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | $ 990 | $ 703
90 days past due and accruing | 55 |
Nonaccrual with no related ACL | 208 |
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 506 | 245
90 days past due and accruing | 33 |
Nonaccrual with no related ACL | 46 |
Commercial | Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 366 | 240
90 days past due and accruing | 33 |
Nonaccrual with no related ACL | 40 |
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 61 | 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 | 79 | 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 | 484 | 458
90 days past due and accruing | 22 |
Nonaccrual with no related ACL | 162 |
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 112 | 93
90 days past due and accruing | 13 |
Nonaccrual with no related ACL | 54 |
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 254 | 246
90 days past due and accruing | 0 |
Nonaccrual with no related ACL | 86 |
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 67 | 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 | 18 | 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 | 7 |
Nonaccrual with no related ACL | $ 0 |

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