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Investments - Available-for-Sale Investment Securities, Unrealized Gains and Losses (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 291	$ 286
Gross Unrealized Gain	1	1
Gross Unrealized Loss	0	(1)
Available-for-sale securities	292	286
Government and agency securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	80	86
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Available-for-sale securities	80	86
Corporate securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	187	200
Gross Unrealized Gain	1	1
Gross Unrealized Loss	0	(1)
Available-for-sale securities	188	200
Asset-backed securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	24	0
Gross Unrealized Gain	0	0
Gross Unrealized Loss	0	0
Available-for-sale securities	$ 24	$ 0

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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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