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ALLOWANCE FOR CREDIT LOSSES, NONACCRUAL LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Nonaccrual Loans and Leases by Class (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | $ 747 | $ 1,019
90+ days past due and accruing | 312 | 62
Nonaccrual with no related ACL | 425 | 380
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 269 | 458
90+ days past due and accruing | 4 | 21
Nonaccrual with no related ACL | 62 | 58
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 170 | 280
90+ days past due and accruing | 4 | 20
Nonaccrual with no related ACL | 61 | 56
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 98 | 176
90+ days past due and accruing | 0 | 0
Nonaccrual with no related ACL | 1 | 2
Commercial | Leases |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 1 | 2
90+ days past due and accruing | 0 | 1
Nonaccrual with no related ACL | 0 | 0
Retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 478 | 561
90+ days past due and accruing | 308 | 41
Nonaccrual with no related ACL | 363 | 322
Retail | Residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 164 | 167
90+ days past due and accruing | 293 | 30
Nonaccrual with no related ACL | 142 | 96
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 216 | 276
90+ days past due and accruing | 0 | 0
Nonaccrual with no related ACL | 188 | 207
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 55 | 72
90+ days past due and accruing | 0 | 0
Nonaccrual with no related ACL | 29 | 17
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 23 | 18
90+ days past due and accruing | 1 | 2
Nonaccrual with no related ACL | 2 | 2
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 20 | 28
90+ days past due and accruing | 14 | 9
Nonaccrual with no related ACL | 2 | 0
Retail | FHA, VA And USDA Loans |  |
Financing Receivable, Past Due [Line Items] |  |
90+ days past due and accruing | $ 289 | $ 21

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