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DERIVATIVE INSTRUMENTS - Schedule of Interest Rate Fair Value Hedges Hedged Items (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount |  | $ 41,694 | $ 58,656
Fair value hedges |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, Notional Amount |  | 8,472 | 8,929
Fixed maturity securities | Interest rate swaptions |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Carrying Amount of Hedged Assets/ (Liabilities) | [1] | 3,261 | 4,331
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Assets/(Liabilities) |  | $ 216 | $ 237
[1] | The balance includes hedging adjustment on discontinued hedging relationships of $216 in 2021 and $237 in 2020.

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