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ALLOWANCE FOR CREDIT LOSSES, NONACCRUING LOANS AND LEASES, AND CONCENTRATIONS OF CREDIT RISK - Nonaccrual Loans and Leases by Class (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | $ 1,008 | $ 1,019
90+ days past due and accruing | 46 | 62
Nonaccrual with no related ACL | 510 | 380
Commercial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 382 | 458
90+ days past due and accruing | 12 | 21
Nonaccrual with no related ACL | 93 | 58
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 281 | 280
90+ days past due and accruing | 3 | 20
Nonaccrual with no related ACL | 56 | 56
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 100 | 176
90+ days past due and accruing | 9 | 0
Nonaccrual with no related ACL | 37 | 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 | 626 | 561
90+ days past due and accruing | 34 | 41
Nonaccrual with no related ACL | 417 | 322
Retail | Residential mortgages |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 237 | 167
90+ days past due and accruing | 23 | 30
Nonaccrual with no related ACL | 178 | 96
Retail | Home equity |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 269 | 276
90+ days past due and accruing | 0 | 0
Nonaccrual with no related ACL | 202 | 207
Retail | Automobile |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 70 | 72
90+ days past due and accruing | 0 | 0
Nonaccrual with no related ACL | 33 | 17
Retail | Education |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 22 | 18
90+ days past due and accruing | 2 | 2
Nonaccrual with no related ACL | 2 | 2
Retail | Other retail |  |
Financing Receivable, Past Due [Line Items] |  |
Nonaccrual loans and leases | 28 | 28
90+ days past due and accruing | 9 | 9
Nonaccrual with no related ACL | $ 2 | $ 0

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