Fair Value - Supplemental Information Regarding Available-for-Sale Debt Securities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 179	$ 105
Gross Unrealized Gains	1	5
Gross Unrealized Losses	(2)
Estimated Fair Value	178	110
Government
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	83	48
Gross Unrealized Gains	1	2
Gross Unrealized Losses	(1)
Estimated Fair Value	83	50
Corporate
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	62	38
Gross Unrealized Gains		2
Gross Unrealized Losses	(1)
Estimated Fair Value	61	40
Mortgage and Asset-Backed Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	34	19
Gross Unrealized Gains		1
Estimated Fair Value	$ 34	$ 20

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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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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Amortized cost of 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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Amount of 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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