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VARIABLE INTEREST ENTITIES - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Variable Interest Entity [Line Items] |  |  |
Lending to special purpose entities included in loans and leases | $ 123,090,000,000 | $ 119,088,000,000 |
Purchases of debt securities available for sale | 9,271,000,000 | 8,422,000,000 | $ 4,270,000,000
Asset-backed securities |  |  |
Variable Interest Entity [Line Items] |  |  |
Purchases of debt securities available for sale | 893,000,000 |  |
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 | 1,500,000,000 | 1,200,000,000 |
Commercial and industrial | Special Purpose Entities |  |  |
Variable Interest Entity [Line Items] |  |  |
Lending to special purpose entities included in loans and leases | 1,295,000,000 | 1,101,000,000 |
Retail |  |  |
Variable Interest Entity [Line Items] |  |  |
Lending to special purpose entities included in loans and leases | 62,297,000,000 | 61,550,000,000 |
Retail | Education |  |  |
Variable Interest Entity [Line Items] |  |  |
Lending to special purpose entities included in loans and leases | 12,308,000,000 | $ 10,347,000,000 |
Sale of loans | 1,100,000,000 |  |
Gain on sale of loans | $ 35,000,000 |  |

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- Definition Amount of write-down from impairment of an investment in a qualified affordable housing project. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 740 -Section 50 -Paragraph 2 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=116633289&loc=SL49122993-202985 + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References No definition available. + Details
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