DERIVATIVES - Financial Statement Impact of Derivatives By Category (Details) - USD ($) $ in Millions	3 Months Ended				6 Months Ended	9 Months Ended
	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2023	Sep. 30, 2023
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	$ (1,055)	$ (336)	$ (699)	$ 6	$ (693)	$ (1,029)
Total derivatives
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	(1,055)			6
Derivatives
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	527			42
Futures
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	157			16
Options
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	394			6
Futures
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	(24)			20
Embedded derivative
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	(1,582)			(36)
SCS, SIO, MSO and IUL indexed features
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	(2,537)			(36)
Funds withheld receivable
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	(1,017)			0
Modco receivable
Derivatives, Fair Value [Line Items]
Net derivative gains (losses)	$ 1,972			$ 0