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Fair Value - Supplemental Information Regarding Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 201	$ 179
Gross Unrealized Gains		1
Gross Unrealized Losses	(22)	(2)
Estimated Fair Value	179	178
Government
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	107	83
Gross Unrealized Gains		1
Gross Unrealized Losses	(11)	(1)
Estimated Fair Value	96	83
Corporate
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	69	62
Gross Unrealized Losses	(9)	(1)
Estimated Fair Value	60	61
Mortgage and Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	25	34
Gross Unrealized Losses	(2)
Estimated Fair Value	$ 23	$ 34

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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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