DERIVATIVE INSTRUMENTS - Schedule of Interest Rate Fair Value Hedges Hedged Items (Details) - USD ($) $ in Millions		Jun. 30, 2021	Dec. 31, 2020
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		$ 44,327	$ 58,656
Fair value hedges
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, Notional Amount		8,742	8,929
Fixed maturity securities | Interest rate swaptions
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Carrying Amount of Hedged Assets/ (Liabilities)	[1]	3,477	4,331
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of Hedged Assets/(Liabilities)		$ 217	$ 237

[1] The balance includes hedging adjustment on discontinued hedging relationships of $217 in 2021 and $237 in 2020.