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Investments - Available-for-Sale Investment Securities, Unrealized Gains and Losses (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 315	$ 291
Gross Unrealized Gain	1	1
Gross Unrealized Loss	0	0
Fair Value	316	292
Government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	60	80
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	60	80
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	221	187
Gross Unrealized Gain	1	1
Gross Unrealized Loss	0	0
Fair Value	222	188
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	34	24
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	$ 34	$ 24

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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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