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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Variable Interest Entity [Line Items] |  |  |
Lending to special purpose entities included in loans and leases | $ 128,163,000,000 | $ 123,090,000,000 |
Purchases of debt securities available for sale | 12,406,000,000 | 9,271,000,000 | $ 8,422,000,000
LIHTC Investments |  |  |
Variable Interest Entity [Line Items] |  |  |
Net impairment losses recognized in earnings | 0 | 0 | $ 0
Commitments to extend credit | Special Purpose Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Undrawn commitments to extend credit | 1,900,000,000 | 1,500,000,000 |
Commercial and industrial | Special Purpose Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Lending to special purpose entities included in loans and leases | 2,646,000,000 | 1,295,000,000 |
Retail |  |  |
Variable Interest Entity [Line Items] |  |  |
Lending to special purpose entities included in loans and leases | 67,813,000,000 | 62,297,000,000 |
Retail | Education |  |  |
Variable Interest Entity [Line Items] |  |  |
Lending to special purpose entities included in loans and leases | $ 12,997,000,000 | $ 12,308,000,000 |

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