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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Investments Debt And Equity Securities [Abstract]

Schedule of amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value for available-for-sale securities by major security type and class of security

		Amortized cost				Gross unrealized holding gains				Gross unrealized holding losses				Estimated fair value
March 31, 2022
Available-for-sale securities:
Corporate bonds and notes		$	511			$	1			$	(13)			$	499
Municipal bonds			454				—				(13)				441
Total available-for-sale securities		$	965			$	1			$	(26)			$	940

December 31, 2021
Available-for-sale securities:
Corporate bonds and notes		$	1,434			$	8			$	(2	)		$	1,440
Municipal bonds			1,573				—				(3	)			1,570
Total available-for-sale securities		$	3,007			$	8			$	(5	)		$	3,010

Schedule of maturities of marketable securities classified as available-for-sale securities

		Amortized cost				Estimated fair value
Due within one year		$	402			$	398
Due after one year through five years			563				542
Due after five years			—				—
Total available-for-sale securities		$	965			$	940

Schedule of available-for-sale marketable securities with continuous gross unrealized loss position

		Less than 12 months								More than 12 months								Total
		Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses				Estimated fair value				Gross unrealized holding losses
As of March 31, 2022
Corporate bonds and notes		$	254			$	8			$	144			$	5			$	398			$	13
Municipal bonds			292				11				150				2				442				13
Total		$	546			$	19			$	294			$	7			$	840			$	26