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DERIVATIVES - Amounts Recorded in Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Derivative [Line Items] |  |
Last-of-layer hedging amount |  | $ 2,000
Carrying value of hedged asset in lay-of-layer hedging relationship |  | 6,000
Debt Securities |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | $ 0 | 6,042
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | 0 | 29
Long-term borrowed funds |  |
Derivative [Line Items] |  |
Carrying amount of hedged liabilities | 972 | 2,239
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | $ (27) | $ 42

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- Definition Amortized cost of closed portfolio of prepayable financial asset and beneficial interest secured by prepayable financial instrument, used to designate hedging relationship in which hedged item is last layer expected to be remaining at end of hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EEE -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999718-113959 + Details
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- Definition Amount of asset hedged in fair value hedging relationship. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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- Definition Amount of cumulative increase (decrease) in fair value of hedged asset in fair value hedge, attributable to hedged risk. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4EE -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL109999712-113959 + Details
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