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Investments - Debt Securities (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 24,548	$ 22,282
Gross Unrealized Gains	146	267
Gross Unrealized Losses	(863)	(836)
Fair Value	23,831	21,713
Allowance for expected credit losses	0	0
Supporting experience-rated products
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Gains	5	10
Gross Unrealized Losses	(36)	(28)
Fair Value	546	592
U.S. government securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,589	2,071
Gross Unrealized Gains	5	19
Gross Unrealized Losses	(56)	(54)
Fair Value	2,538	2,036
States, municipalities and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,335	2,219
Gross Unrealized Gains	10	31
Gross Unrealized Losses	(22)	(35)
Fair Value	1,323	2,215
U.S. corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	11,720	10,156
Gross Unrealized Gains	69	133
Gross Unrealized Losses	(489)	(446)
Fair Value	11,300	9,843
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,657	2,593
Gross Unrealized Gains	26	41
Gross Unrealized Losses	(130)	(122)
Fair Value	2,553	2,512
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	838	862
Gross Unrealized Gains	3	8
Gross Unrealized Losses	(60)	(60)
Fair Value	781	810
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,201	1,066
Gross Unrealized Gains	5	9
Gross Unrealized Losses	(93)	(100)
Fair Value	1,113	975
Other asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,190	3,294
Gross Unrealized Gains	28	26
Gross Unrealized Losses	(12)	(18)
Fair Value	4,206	3,302
Redeemable preferred securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	18	21
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1)	(1)
Fair Value	$ 17	$ 20

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