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DERIVATIVES - Amounts Recorded in Balance Sheet (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Carrying amount of hedged assets | $ 0 | $ 0
Last-of-layer hedging amount | 2,000 |
Debt securities available for sale |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets | 10,869 | 15,798
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | 96 | (8)
Carrying value of hedged asset in lay-of-layer hedging relationship | 15,800 |
Residential mortgages |  |
Derivative [Line Items] |  |
Carrying amount of hedged assets |  | 976
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items |  | 17
Debt securities available for sale |  |
Derivative [Line Items] |  |
Carrying amount of hedged liabilities | 0 | 0
Residential mortgages |  |
Derivative [Line Items] |  |
Carrying amount of hedged liabilities |  | 0
Long-term borrowed funds |  |
Derivative [Line Items] |  |
Carrying amount of hedged liabilities | 3,307 | 4,689
Cumulative amount of fair value hedging adjustments included in the carrying amount of the hedged items | $ 112 | $ 50

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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 http://asc.fasb.org/extlink&oid=121590274&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 http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959 + Details
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- Definition Amount of liability 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 http://asc.fasb.org/extlink&oid=121590274&loc=SL109999712-113959 + Details
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