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Fair Value - Supplemental Information Regarding Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 208	$ 199
Gross Unrealized Losses	(16)	(17)
Estimated Fair Value	192	182
Government
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	125	118
Gross Unrealized Losses	(11)	(10)
Estimated Fair Value	114	108
Corporate
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	72	65
Gross Unrealized Losses	(5)	(6)
Estimated Fair Value	67	59
Mortgage and Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	11	16
Gross Unrealized Losses	0	(1)
Estimated Fair Value	$ 11	$ 15

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Amount, before tax, of unrealized loss 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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