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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, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 61,429		$ 56,854
Gross Unrealized Gains	792		1,383
Gross Unrealized Losses	(623)		(242)
Allowance for Credit Losses	0	$ (4)	(3)	$ (2)	$ (9)	$ (25)
Fair Value	61,598		57,992
U.S. treasury and government
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	69		68
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(1)		0
Allowance for Credit Losses	0		0
Fair Value	68		68
U.S. state and municipal
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,829		2,866
Gross Unrealized Gains	78		105
Gross Unrealized Losses	(21)		(19)
Allowance for Credit Losses	0		(3)
Fair Value	2,886		2,949
Foreign governments
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,238		1,118
Gross Unrealized Gains	24		51
Gross Unrealized Losses	(24)		0
Allowance for Credit Losses	0		0
Fair Value	3,238		1,169
Corporate debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	44,021		42,310
Gross Unrealized Gains	523		974
Gross Unrealized Losses	(401)		(143)
Allowance for Credit Losses	0	0	0	(1)	(7)	(24)
Fair Value	44,143		43,141
Residential mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	862		966
Gross Unrealized Gains	36		44
Gross Unrealized Losses	(2)		(2)
Allowance for Credit Losses	0	0	0	0	(1)	(1)
Fair Value	896		1,008
Commercial mortgage-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,830		3,051
Gross Unrealized Gains	68		101
Gross Unrealized Losses	(38)		(31)
Allowance for Credit Losses	0		0
Fair Value	2,860		3,121
Collateralized debt securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	7,580		6,475
Gross Unrealized Gains	63		108
Gross Unrealized Losses	(136)		(47)
Allowance for Credit Losses	0	$ 0	0	$ (1)	$ (1)	$ 0
Fair Value	$ 7,507		$ 6,536