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DERIVATIVES - Schedule of Fair Value Hedges (Details) - Hedge of interest rate risk - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Interest expense - long-term borrowed funds |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative | $ (72) | $ 65 | $ 107
Hedged Item | 71 | (63) | (107)
Interest and fees on loans and leases |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative | 0 | 17 | (17)
Hedged Item | 0 | (17) | 17
Interest income - investment securities |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative | 68 | (104) | 8
Hedged Item | $ (68) | $ 104 | $ (8)

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- Definition Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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- Definition Amount of the increase (decrease) in fair value of the hedged item in a fair value hedge recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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