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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 4,474	$ 4,400
Gross Unrealized Gains	27	14
Gross Unrealized Losses	63	89
Estimated Fair Value	4,438	4,325
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,757	2,769
Gross Unrealized Gains	17	10
Gross Unrealized Losses	23	35
Estimated Fair Value	2,751	2,744
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,008	953
Gross Unrealized Gains	6	2
Gross Unrealized Losses	31	41
Estimated Fair Value	983	914
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	443	435
Gross Unrealized Gains	3	2
Gross Unrealized Losses	5	6
Estimated Fair Value	441	431
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	212	188
Gross Unrealized Gains	1	0
Gross Unrealized Losses	3	5
Estimated Fair Value	210	183
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5	5
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	5	5
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	49	50
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1	2
Estimated Fair Value	$ 48	$ 48

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