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DERIVATIVE INSTRUMENTS - Schedule of Interest Rate Fair Value Hedges Hedged Items (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net derivatives notional amount |  | $ 61,695 | $ 38,355
Fair value hedges |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net derivatives notional amount |  | 12,780 | 11,656
Interest rate swaptions | Fair value hedges |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net derivatives notional amount |  | 243 | 500
Fixed maturity securities | Interest rate swaptions |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Carrying Amount of Hedged Assets/ (Liabilities) | [1] | 4,633 | 6,593
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Assets/ (Liabilities) |  | $ 256 | $ 294
[1] | The balance includes hedging adjustment on discontinued hedging relationships of $256 in 2019 and $294 in 2018.

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + 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=109980867&loc=SL109999712-113959 + Details
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