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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 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 125,713 |  | $ 119,088
ACL Balance | $ 2,527 | $ 1,747 | $ 1,296
Coverage | 2.00% | 1.50% | 1.10%
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 64,930 |  | $ 57,538
ACL Balance | $ 1,304 | $ 539 | $ 718
Coverage | 2.00% | 0.90% | 1.20%
Commercial | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 48,017 |  | $ 41,479
ACL Balance | $ 847 | $ 376 | $ 575
Coverage | 1.80% | 0.90% | 1.40%
Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 14,485 |  | $ 13,522
ACL Balance | $ 330 | $ 67 | $ 124
Coverage | 2.30% | 0.50% | 0.90%
Commercial | Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 2,428 |  | $ 2,537
ACL Balance | $ 127 | $ 96 | $ 19
Coverage | 5.20% | 3.80% | 0.70%
Commercial | SBA Guaranteed PPP Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 4,700 |  |
Coverage reduction, basis points | 0.19% |  |
Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 60,783 |  | $ 61,550
ACL Balance | $ 1,223 | $ 1,208 | $ 578
Coverage | 2.00% | 2.00% | 0.90%
Retail | Residential mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 19,245 |  | $ 19,083
ACL Balance | $ 104 | $ 130 | $ 35
Coverage | 0.50% | 0.70% | 0.20%
Retail | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 12,541 |  | $ 13,154
ACL Balance | $ 143 | $ 156 | $ 83
Coverage | 1.10% | 1.20% | 0.60%
Retail | Automobile |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 12,028 |  | $ 12,120
ACL Balance | $ 277 | $ 206 | $ 123
Coverage | 2.30% | 1.70% | 1.00%
Retail | Education |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 10,591 |  | $ 10,347
ACL Balance | $ 312 | $ 414 | $ 116
Coverage | 2.90% | 4.00% | 1.10%
Retail | Other retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and leases | $ 6,378 |  | $ 6,846
ACL Balance | $ 387 | $ 302 | $ 221
Coverage | 6.10% | 4.40% | 3.20%
Accounting Standards Update 2016-13 |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | $ 451 |
Accounting Standards Update 2016-13 | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | (179) |
Accounting Standards Update 2016-13 | Commercial | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | (199) |
Accounting Standards Update 2016-13 | Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | (57) |
Accounting Standards Update 2016-13 | Commercial | Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | 77 |
Accounting Standards Update 2016-13 | Retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | 630 |
Accounting Standards Update 2016-13 | Retail | Residential mortgages |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | 95 |
Accounting Standards Update 2016-13 | Retail | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | 73 |
Accounting Standards Update 2016-13 | Retail | Automobile |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | 83 |
Accounting Standards Update 2016-13 | Retail | Education |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | 298 |
Accounting Standards Update 2016-13 | Retail | Other retail |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
ACL Balance |  | $ 81 |

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