EQUITY - Cumulative Gains (Losses) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI	$ 2,074	$ 2,160	$ 1,506	$ 1,431	$ 372	$ 231
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI	(699)	(694)	$ (750)	$ (345)	$ (302)	$ (381)
Unrealized gains (losses) on investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI	(140)	(51)
Market risk benefits - instrument-specific credit risk component
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI	(587)	(649)
Liability or future policy benefits - current discount rate component
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI	$ 28	$ 6