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Available-For-Sale Fixed Maturity Securities - Amortized Cost and Fair Value of Available-for-Sale Fixed Maturity Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	May 25, 2022	May 24, 2022	Dec. 31, 2021
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 47,127	$ 13,281
Gross Unrealized Gains	664	89
Gross Unrealized Losses	(472)	(469)
Allowance for Credit Losses	(27)	(24)	$ (29)	$ 0	$ (32)	$ (10)
Fair Value	47,292	12,877
U.S. treasury and government
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	87	63
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(1)
Allowance for Credit Losses	0	0
Fair Value	86	62
U.S. states and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,200	594
Gross Unrealized Gains	37	1
Gross Unrealized Losses	(30)	(17)
Allowance for Credit Losses	0	0
Fair Value	3,207	578
Foreign governments
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,568	9
Gross Unrealized Gains	6	0
Gross Unrealized Losses	(33)	0
Allowance for Credit Losses	0	0
Fair Value	1,541	9
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	32,770	11,144
Gross Unrealized Gains	454	79
Gross Unrealized Losses	(350)	(420)
Allowance for Credit Losses	(26)	(19)	(24)	0	(28)	(7)
Fair Value	32,848	10,784
Residential mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,086	131
Gross Unrealized Gains	25	0
Gross Unrealized Losses	(4)	(4)
Allowance for Credit Losses	(1)	(1)	0	0	0	0
Fair Value	1,106	126
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,755	0
Gross Unrealized Gains	65	0
Gross Unrealized Losses	(24)	0
Allowance for Credit Losses	0	0	0	0	0	0
Fair Value	2,796	0
Collateralized debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	5,661	1,340
Gross Unrealized Gains	77	9
Gross Unrealized Losses	(30)	(27)
Allowance for Credit Losses	0	(4)	$ (5)	$ 0	$ (4)	$ (3)
Fair Value	$ 5,708	$ 1,318

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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