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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	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 54,104		$ 47,127
Gross Unrealized Gains	1,509		664
Gross Unrealized Losses	(202)		(472)
Allowance for Credit Losses	(3)	$ (2)	(27)	$ (22)	$ (37)	$ (24)
Fair Value	55,408		47,292
U.S. treasury and government
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	92		87
Gross Unrealized Gains	1		0
Gross Unrealized Losses	0		(1)
Allowance for Credit Losses	0		0
Fair Value	93		86
U.S. state and municipal
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,043		3,200
Gross Unrealized Gains	115		37
Gross Unrealized Losses	(21)		(30)
Allowance for Credit Losses	(3)		0
Fair Value	3,134		3,207
Foreign governments
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,199		1,568
Gross Unrealized Gains	45		6
Gross Unrealized Losses	(4)		(33)
Allowance for Credit Losses	0		0
Fair Value	1,240		1,541
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	40,596		32,770
Gross Unrealized Gains	1,089		454
Gross Unrealized Losses	(104)		(350)
Allowance for Credit Losses	0	(1)	(26)	(20)	(34)	(19)
Fair Value	41,581		32,848
Residential mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	953		1,086
Gross Unrealized Gains	41		25
Gross Unrealized Losses	(2)		(4)
Allowance for Credit Losses	0	0	(1)	(1)	(1)	(1)
Fair Value	992		1,106
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,219		2,755
Gross Unrealized Gains	104		65
Gross Unrealized Losses	(32)		(24)
Allowance for Credit Losses	0		0
Fair Value	3,291		2,796
Collateralized debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	5,002		5,661
Gross Unrealized Gains	114		77
Gross Unrealized Losses	(39)		(30)
Allowance for Credit Losses	0	$ (1)	0	$ (1)	$ (2)	$ (4)
Fair Value	$ 5,077		$ 5,708

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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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