Investments - Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 26,562	$ 22,282
Gross Unrealized Gains	178	267
Gross Unrealized Losses	(707)	(836)
Fair Value	26,033	21,713
Allowance for expected credit losses	0	0
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,826	2,071
Gross Unrealized Gains	7	19
Gross Unrealized Losses	(38)	(54)
Fair Value	2,795	2,036
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	712	2,219
Gross Unrealized Gains	4	31
Gross Unrealized Losses	(18)	(35)
Fair Value	698	2,215
U.S. corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	13,043	10,156
Gross Unrealized Gains	94	133
Gross Unrealized Losses	(412)	(446)
Fair Value	12,725	9,843
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,608	2,593
Gross Unrealized Gains	27	41
Gross Unrealized Losses	(111)	(122)
Fair Value	2,524	2,512
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	792	862
Gross Unrealized Gains	2	8
Gross Unrealized Losses	(54)	(60)
Fair Value	740	810
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,731	1,066
Gross Unrealized Gains	9	9
Gross Unrealized Losses	(67)	(100)
Fair Value	1,673	975
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,834	3,294
Gross Unrealized Gains	35	26
Gross Unrealized Losses	(7)	(18)
Fair Value	4,862	3,302
Redeemable preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	16	21
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(1)
Fair Value	16	20
Supporting experience- rated products
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	5	10
Gross Unrealized Losses	(30)	(28)
Fair Value	$ 543	$ 592

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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