Investments - Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 29,564	$ 28,600
Gross Unrealized Gains	207	449
Gross Unrealized Losses	(422)	(331)
Fair Value	29,349	28,718
Allowance for expected credit losses	0	0
Supporting Experience-Rated Products
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	7	10
Gross Unrealized Losses	(17)	(16)
Fair Value	444	475
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,579	2,691
Gross Unrealized Gains	9	39
Gross Unrealized Losses	(14)	(8)
Fair Value	2,574	2,722
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	253	296
Gross Unrealized Gains	2	3
Gross Unrealized Losses	(6)	(7)
Fair Value	249	292
U.S. corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,947	14,657
Gross Unrealized Gains	123	262
Gross Unrealized Losses	(292)	(231)
Fair Value	15,778	14,688
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,146	2,981
Gross Unrealized Gains	51	78
Gross Unrealized Losses	(34)	(31)
Fair Value	3,163	3,028
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,186	1,065
Gross Unrealized Gains	7	14
Gross Unrealized Losses	(34)	(29)
Fair Value	1,159	1,050
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,975	1,974
Gross Unrealized Gains	7	28
Gross Unrealized Losses	(34)	(23)
Fair Value	1,948	1,979
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,464	4,921
Gross Unrealized Gains	8	25
Gross Unrealized Losses	(8)	(2)
Fair Value	4,464	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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