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Investments - Amortized Cost or Cost and Fair Value of Available for Sale Securities (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2026	Dec. 31, 2025	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 71,936	$ 71,772
Allowance for Credit Losses	(38)	(37)	$ (30)	$ (38)
Gross Unrealized Gains	750	1,178
Gross Unrealized Losses	(2,120)	(1,881)
Bonds available for sale	70,528	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	$ 2,385	$ 3,353
Allowance for Credit Losses	0	0
Gross Unrealized Gains	19	31
Gross Unrealized Losses	(88)	(86)
Bonds available for sale	2,316	3,298
Obligations of states, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,694	2,757
Allowance for Credit Losses	0	0
Gross Unrealized Gains	54	71
Gross Unrealized Losses	(52)	(53)
Bonds available for sale	2,696	2,775
Non-U.S. governments
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6,633	6,799
Allowance for Credit Losses	0	(1)
Gross Unrealized Gains	53	86
Gross Unrealized Losses	(395)	(368)
Bonds available for sale	6,291	6,516
Corporate debt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	38,737	37,746
Allowance for Credit Losses	(32)	(31)
Gross Unrealized Gains	318	576
Gross Unrealized Losses	(1,221)	(1,056)
Bonds available for sale	37,802	37,235
Mortgage-backed, asset-backed and collateralized
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	21,487	21,117
Allowance for Credit Losses	(6)	(5)
Gross Unrealized Gains	306	414
Gross Unrealized Losses	(364)	(318)
Bonds available for sale	21,423	21,208
RMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,150	10,137
Allowance for Credit Losses	(5)	(4)
Gross Unrealized Gains	231	294
Gross Unrealized Losses	(304)	(259)
Bonds available for sale	11,072	10,168
CMBS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,626	4,585
Allowance for Credit Losses	(1)	0
Gross Unrealized Gains	50	67
Gross Unrealized Losses	(39)	(36)
Bonds available for sale	4,636	4,616
CLO/ABS
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,711	6,395
Allowance for Credit Losses	0	(1)
Gross Unrealized Gains	25	53
Gross Unrealized Losses	(21)	(23)
Bonds available for sale	$ 5,715	$ 6,424