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ALLOWANCE FOR CREDIT LOSSES, NONPERFORMING ASSETS, AND CONCENTRATIONS OF CREDIT RISK - Schedule of Additional Detail on the Cumulative Effect of Change in Accounting Principle (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 127,528 |  | $ 119,088
ACL Balance | 2,210 | $ 1,747 | 1,296
Allowance for loan and lease losses | $ 2,171 |  | $ 1,252
Coverage | 1.70% | 1.50% | 1.10%
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 66,032 |  | $ 57,538
ACL Balance | $ 790 | $ 539 | $ 718
Coverage | 1.20% | 0.90% | 1.20%
Commercial | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 49,092 |  | $ 41,479
ACL Balance | $ 613 | $ 376 | $ 575
Coverage | 1.20% | 0.90% | 1.40%
Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 14,502 |  | $ 13,522
ACL Balance | $ 74 | $ 67 | $ 124
Coverage | 0.50% | 0.50% | 0.90%
Commercial | Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 2,438 |  | $ 2,537
ACL Balance | $ 103 | $ 96 | $ 19
Coverage | 4.20% | 3.80% | 0.70%
Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 61,496 |  | $ 61,550
ACL Balance | $ 1,420 | $ 1,208 | $ 578
Coverage | 2.30% | 2.00% | 0.90%
Retail | Residential mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 18,721 |  | $ 19,083
ACL Balance | $ 153 | $ 130 | $ 35
Coverage | 0.80% | 0.70% | 0.20%
Retail | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 12,992 |  | $ 13,154
ACL Balance | $ 169 | $ 156 | $ 83
Coverage | 1.30% | 1.20% | 0.60%
Retail | Automobile |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 12,157 |  | $ 12,120
ACL Balance | $ 278 | $ 206 | $ 123
Coverage | 2.30% | 1.70% | 1.00%
Retail | Education |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 10,887 |  | $ 10,347
ACL Balance | $ 473 | $ 414 | $ 116
Coverage | 4.30% | 4.00% | 1.10%
Retail | Other retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 6,739 |  | $ 6,846
ACL Balance | $ 347 | $ 302 | $ 221
Coverage | 5.10% | 4.40% | 3.20%
Accounting Standards Update 2016-13 |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | $ 451 |
Accounting Standards Update 2016-13 | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | (179) |
Accounting Standards Update 2016-13 | Commercial | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | (199) |
Accounting Standards Update 2016-13 | Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | (57) |
Accounting Standards Update 2016-13 | Commercial | Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | 77 |
Accounting Standards Update 2016-13 | Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | 630 |
Accounting Standards Update 2016-13 | Retail | Residential mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | 95 |
Accounting Standards Update 2016-13 | Retail | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | 73 |
Accounting Standards Update 2016-13 | Retail | Automobile |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | 83 |
Accounting Standards Update 2016-13 | Retail | Education |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | 298 |
Accounting Standards Update 2016-13 | Retail | Other retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for loan and lease losses |  | $ 81 |

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