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Investments - Reconciliation of Available-for-Sale Securities from Cost Basis to Fair Value (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	$ 98,529		$ 97,415
Gross Unrealized Gains	921		747
Gross Unrealized Losses	9,979		11,005
Allowance for Credit Losses	85	$ 74	46	$ 39	$ 21	$ 19
Fair Value	89,386		87,111
Corporate bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	75,551		75,556
Gross Unrealized Gains	706		563
Gross Unrealized Losses	8,849		9,655
Allowance for Credit Losses	36	23	14	13	10	8
Fair Value	67,372		66,450
U.S. government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	591		429
Gross Unrealized Gains	6		3
Gross Unrealized Losses	34		41
Allowance for Credit Losses	0		0
Fair Value	563		391
State and municipal bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,663		2,798
Gross Unrealized Gains	17		18
Gross Unrealized Losses	426		445
Allowance for Credit Losses	0		0
Fair Value	2,254		2,371
Foreign government bonds
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	281		282
Gross Unrealized Gains	13		11
Gross Unrealized Losses	55		56
Allowance for Credit Losses	0		0
Fair Value	239		237
RMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,217		2,066
Gross Unrealized Gains	30		24
Gross Unrealized Losses	179		220
Allowance for Credit Losses	5	6	7	6	6	6
Fair Value	2,063		1,863
CMBS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	2,080		1,817
Gross Unrealized Gains	10		4
Gross Unrealized Losses	118		156
Allowance for Credit Losses	0		0
Fair Value	1,972		1,665
ABS
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	14,892		14,226
Gross Unrealized Gains	116		99
Gross Unrealized Losses	307		421
Allowance for Credit Losses	43	$ 44	24	$ 19	$ 4	$ 4
Fair Value	14,658		13,880
Hybrid and redeemable preferred securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	254		241
Gross Unrealized Gains	23		25
Gross Unrealized Losses	11		11
Allowance for Credit Losses	1		1
Fair Value	$ 265		$ 254