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DERIVATIVES - Schedule of Fair Value Hedges (Details) - Interest rate swap - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Interest expense - borrowed funds |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative | $ 5 | $ 64 | $ 98 | $ 104
Hedged Item | (3) | (64) | (95) | (103)
Interest and fees on loans and leases |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative | 0 | (16) | 17 | (16)
Hedged Item | 0 | 16 | (17) | 16
Interest income - investment securities |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative | (14) | 0 | (121) | 0
Hedged Item | $ 14 | $ 0 | $ 121 | $ 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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