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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Interest expense - long-term borrowed funds |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative | $ 107 | $ 8 | $ (26)
Hedged Item | (107) | (9) | 27
Interest and fees on loans and leases |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative | (17) | 0 | 0
Hedged Item | 17 | 0 | 0
Interest income - investment securities |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Derivative | 8 | 0 | 0
Hedged Item | $ (8) | $ 0 | $ 0

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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=109977999&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=109977999&loc=d3e76258-113986 + Details
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