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Investments - Available-for-Sale Investment Securities, Unrealized Gains and Losses (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 301	$ 291
Gross Unrealized Gain	2	1
Gross Unrealized Loss	0	0
Fair Value	303	292
Government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	66	80
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	66	80
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	203	187
Gross Unrealized Gain	2	1
Gross Unrealized Loss	0	0
Fair Value	205	188
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	32	24
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Fair Value	$ 32	$ 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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