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Investments - Amortized Cost or Cost and Fair Value of Available for Sale Securities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2026	Dec. 31, 2025	Mar. 31, 2026	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 72,710	$ 71,772
Allowance for Credit Losses	(35)	(37)	$ (38)	$ (45)	$ (30)	$ (38)
Gross Unrealized Gains	738	1,178
Gross Unrealized Losses	(1,941)	(1,881)
Bonds available for sale	71,472	71,032
Non-Investment Grade
Debt Securities, Available-for-sale [Line Items]
Bonds available for sale	$ 5,700	$ 5,900
Non-Investment Grade \| Credit Concentration Risk \| Bonds available for sale
Debt Securities, Available-for-sale [Line Items]
Concentration risk (as a percent)	8.00%	8.00%
U.S. government and government sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,862	$ 3,353
Allowance for Credit Losses	0	0
Gross Unrealized Gains	9	31
Gross Unrealized Losses	(92)	(86)
Bonds available for sale	2,779	3,298
Obligations of states, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,698	2,757
Allowance for Credit Losses	0	0
Gross Unrealized Gains	40	71
Gross Unrealized Losses	(54)	(53)
Bonds available for sale	2,684	2,775
Non-U.S. governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,381	6,799
Allowance for Credit Losses	0	(1)
Gross Unrealized Gains	63	86
Gross Unrealized Losses	(366)	(368)
Bonds available for sale	6,078	6,516
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	39,007	37,746
Allowance for Credit Losses	(33)	(31)
Gross Unrealized Gains	353	576
Gross Unrealized Losses	(1,050)	(1,056)
Bonds available for sale	38,277	37,235
Mortgage-backed, asset-backed and collateralized
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,762	21,117
Allowance for Credit Losses	(2)	(5)
Gross Unrealized Gains	273	414
Gross Unrealized Losses	(379)	(318)
Bonds available for sale	21,654	21,208
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,168	10,137
Allowance for Credit Losses	(2)	(4)
Gross Unrealized Gains	222	294
Gross Unrealized Losses	(320)	(259)
Bonds available for sale	11,068	10,168
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,946	4,585
Allowance for Credit Losses	0	0
Gross Unrealized Gains	29	67
Gross Unrealized Losses	(36)	(36)
Bonds available for sale	4,939	4,616
CLO/ABS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,648	6,395
Allowance for Credit Losses	0	(1)
Gross Unrealized Gains	22	53
Gross Unrealized Losses	(23)	(23)
Bonds available for sale	$ 5,647	$ 6,424