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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	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 48,260		$ 47,127
Gross Unrealized Gains	1,038		664
Gross Unrealized Losses	(365)		(472)
Allowance for Credit Losses	(2)	$ (11)	(27)	$ (37)	$ (28)	$ (24)
Fair Value	48,931		47,292
U.S. treasury and government
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	93		87
Gross Unrealized Gains	1		0
Gross Unrealized Losses	(1)		(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	3,093		3,200
Gross Unrealized Gains	63		37
Gross Unrealized Losses	(35)		(30)
Allowance for Credit Losses	0		0
Fair Value	3,121		3,207
Foreign governments
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,315		1,568
Gross Unrealized Gains	16		6
Gross Unrealized Losses	(13)		(33)
Allowance for Credit Losses	0		0
Fair Value	1,318		1,541
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	34,373		32,770
Gross Unrealized Gains	733		454
Gross Unrealized Losses	(217)		(350)
Allowance for Credit Losses	(1)	(9)	(26)	(34)	(24)	(19)
Fair Value	34,888		32,848
Residential mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	966		1,086
Gross Unrealized Gains	35		25
Gross Unrealized Losses	(2)		(4)
Allowance for Credit Losses	0	(1)	(1)	(1)	(1)	(1)
Fair Value	999		1,106
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,196		2,755
Gross Unrealized Gains	98		65
Gross Unrealized Losses	(35)		(24)
Allowance for Credit Losses	0		0
Fair Value	3,259		2,796
Collateralized debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	5,224		5,661
Gross Unrealized Gains	92		77
Gross Unrealized Losses	(62)		(30)
Allowance for Credit Losses	(1)	$ (1)	0	$ (2)	$ (3)	$ (4)
Fair Value	$ 5,253		$ 5,708