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Investments - Amortized Cost or Cost and Fair Value of Available for Sale Securities (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2026	Dec. 31, 2025	Jun. 30, 2026	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 74,858	$ 71,772
Allowance for Credit Losses	(24)	(37)	$ (35)	$ (43)	$ (45)	$ (38)
Gross Unrealized Gains	316	1,178
Gross Unrealized Losses	(3,508)	(1,881)
Bonds available for sale	71,642	71,032
Non-Investment Grade
Debt Securities, Available-for-sale [Line Items]
Bonds available for sale	$ 5,900	$ 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	$ 3,758	$ 3,353
Allowance for Credit Losses	0	0
Gross Unrealized Gains	3	31
Gross Unrealized Losses	(137)	(86)
Bonds available for sale	3,624	3,298
Obligations of states, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,440	2,757
Allowance for Credit Losses	0	0
Gross Unrealized Gains	13	71
Gross Unrealized Losses	(124)	(53)
Bonds available for sale	2,329	2,775
Non-U.S. governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,603	6,799
Allowance for Credit Losses	0	(1)
Gross Unrealized Gains	30	86
Gross Unrealized Losses	(460)	(368)
Bonds available for sale	6,173	6,516
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	40,216	37,746
Allowance for Credit Losses	(22)	(31)
Gross Unrealized Gains	117	576
Gross Unrealized Losses	(2,028)	(1,056)
Bonds available for sale	38,283	37,235
Mortgage-backed, asset-backed and collateralized
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,841	21,117
Allowance for Credit Losses	(2)	(5)
Gross Unrealized Gains	153	414
Gross Unrealized Losses	(759)	(318)
Bonds available for sale	21,233	21,208
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,471	10,137
Allowance for Credit Losses	(2)	(4)
Gross Unrealized Gains	142	294
Gross Unrealized Losses	(581)	(259)
Bonds available for sale	11,030	10,168
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,854	4,585
Allowance for Credit Losses	0	0
Gross Unrealized Gains	4	67
Gross Unrealized Losses	(108)	(36)
Bonds available for sale	4,750	4,616
CLO/ABS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,516	6,395
Allowance for Credit Losses	0	(1)
Gross Unrealized Gains	7	53
Gross Unrealized Losses	(70)	(23)
Bonds available for sale	$ 5,453	$ 6,424