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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Variable Interest Entity |  |  |  |  |  |
Lending to special purpose entities included in loans and leases | $ 124,071 | $ 124,071 |  | $ 124,071 |  | $ 119,088
Purchases of debt securities available for sale | 813 |  |  | 5,547 | $ 4,633 |
Special Purpose Entities | Commitments to extend credit |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Commitment amount | 1,300 | 1,300 |  | 1,300 |  | 1,200
Special Purpose Entities | Commercial |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Lending to special purpose entities included in loans and leases | 1,173 | 1,173 |  | 1,173 |  | 1,101
LIHTC Investments |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Net impairment losses recognized in earnings |  | 0 | $ 0 | 0 | $ 0 |
Retail |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Lending to special purpose entities included in loans and leases | 61,709 | 61,709 |  | 61,709 |  | 61,550
Retail | Education |  |  |  |  |  |
Variable Interest Entity |  |  |  |  |  |
Lending to special purpose entities included in loans and leases | 11,631 | 11,631 |  | 11,631 |  | $ 10,347
Sale of loans | 973 | $ 973 |  | $ 973 |  |
Gain on sale of loans | $ 32 |  |  |  |  |

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