Investments - Debt Securities (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 28,593	$ 28,600
Gross Unrealized Gains	245	449
Gross Unrealized Losses	(447)	(331)
Fair Value	28,391	28,718
Allowance for expected credit losses	0	0
Supporting Experience-Rated Products
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	6	10
Gross Unrealized Losses	(19)	(16)
Fair Value	433	475
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,725	2,691
Gross Unrealized Gains	20	39
Gross Unrealized Losses	(10)	(8)
Fair Value	2,735	2,722
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	273	296
Gross Unrealized Gains	2	3
Gross Unrealized Losses	(7)	(7)
Fair Value	268	292
U.S. corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,104	14,657
Gross Unrealized Gains	143	262
Gross Unrealized Losses	(314)	(231)
Fair Value	14,933	14,688
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,024	2,981
Gross Unrealized Gains	47	78
Gross Unrealized Losses	(50)	(31)
Fair Value	3,021	3,028
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,090	1,065
Gross Unrealized Gains	10	14
Gross Unrealized Losses	(31)	(29)
Fair Value	1,069	1,050
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,889	1,974
Gross Unrealized Gains	14	28
Gross Unrealized Losses	(28)	(23)
Fair Value	1,875	1,979
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,474	4,921
Gross Unrealized Gains	9	25
Gross Unrealized Losses	(7)	(2)
Fair Value	4,476	4,944
Redeemable preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	14	15
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 14	$ 15

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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