EQUITY - Cumulative Gains (Losses) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	$ 3,385	$ 3,755	$ 4,388	$ 5,260	$ 5,471	$ 3,141
Total accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	(8,686)		(7,817)
Unrealized gains (losses) on investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	(7,569)		(6,638)
Market risk benefits - instrument-specific credit risk component
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	(795)		(633)
Liability for future policy benefits - current discount rate component
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	391		182
Defined benefit pension plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	(634)		(652)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	(79)		(76)
Less: Accumulated other comprehensive income (loss) attributable to noncontrolling interest
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	(41)		(40)
Accumulated other comprehensive income (loss) attributable to Holdings
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss) attributable to Holdings	$ (8,645)	$ (8,166)	$ (7,777)	$ (7,142)	$ (6,516)	$ (8,992)