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Investments - Reconciliation of Available-for-Sale Securities from Cost Basis to Fair Value (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	$ 103,761		$ 101,462
Gross Unrealized Gains	795		1,095
Gross Unrealized Losses	9,332		8,999
Allowance for Credit Losses	139	$ 111	110	$ 85	$ 74	$ 46
Fair Value	95,085		93,448
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	75,626		76,318
Gross Unrealized Gains	625		834
Gross Unrealized Losses	8,305		8,054
Allowance for Credit Losses	45	38	53	36	23	14
Fair Value	67,901		69,045
U.S. government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	1,001		892
Gross Unrealized Gains	3		9
Gross Unrealized Losses	42		32
Allowance for Credit Losses	0		0
Fair Value	962		869
State and municipal bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,437		2,514
Gross Unrealized Gains	13		18
Gross Unrealized Losses	383		385
Allowance for Credit Losses	0		0
Fair Value	2,067		2,147
Foreign government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	240		261
Gross Unrealized Gains	14		16
Gross Unrealized Losses	51		51
Allowance for Credit Losses	0		0
Fair Value	203		226
RMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,080		2,237
Gross Unrealized Gains	36		45
Gross Unrealized Losses	157		154
Allowance for Credit Losses	6	6	6	5	6	7
Fair Value	1,953		2,122
CMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	3,002		2,586
Gross Unrealized Gains	5		15
Gross Unrealized Losses	116		99
Allowance for Credit Losses	3	0	0	0	0	0
Fair Value	2,888		2,502
ABS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	19,161		16,412
Gross Unrealized Gains	91		137
Gross Unrealized Losses	270		217
Allowance for Credit Losses	84	$ 66	50	$ 43	$ 44	$ 24
Fair Value	18,898		16,282
Hybrid and redeemable preferred securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	214		242
Gross Unrealized Gains	8		21
Gross Unrealized Losses	8		7
Allowance for Credit Losses	1		1
Fair Value	$ 213		$ 255