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Investments - Debt Securities (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 27,705	$ 26,562
Gross Unrealized Gains	462	178
Gross Unrealized Losses	(332)	(707)
Fair Value	27,835	26,033
Allowance for expected credit losses	0	0
Supporting experience-rated products
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	11	5
Gross Unrealized Losses	(15)	(30)
Fair Value	487	543
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,850	2,826
Gross Unrealized Gains	42	7
Gross Unrealized Losses	(7)	(38)
Fair Value	2,885	2,795
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	293	712
Gross Unrealized Gains	2	4
Gross Unrealized Losses	(8)	(18)
Fair Value	287	698
U.S. corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,768	13,043
Gross Unrealized Gains	266	94
Gross Unrealized Losses	(214)	(412)
Fair Value	13,820	12,725
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,798	2,608
Gross Unrealized Gains	76	27
Gross Unrealized Losses	(36)	(111)
Fair Value	2,838	2,524
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	963	792
Gross Unrealized Gains	12	2
Gross Unrealized Losses	(34)	(54)
Fair Value	941	740
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,935	1,731
Gross Unrealized Gains	32	9
Gross Unrealized Losses	(32)	(67)
Fair Value	1,935	1,673
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,083	4,834
Gross Unrealized Gains	32	35
Gross Unrealized Losses	(1)	(7)
Fair Value	5,114	4,862
Redeemable preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15	16
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 15	$ 16

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