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Investments - Available-for-Sale Investment Securities, Unrealized Gains and Losses (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 279	$ 278
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(3)	(6)
Fair Value	276	272
Government and agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	93	91
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(1)	(2)
Fair Value	92	89
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	186	187
Gross Unrealized Gain	0	0
Gross Unrealized Loss	(2)	(4)
Fair Value	$ 184	$ 183

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- Definition

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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