Investments (Tables)

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Gross Unrealized Gains and (Losses) Aggregated by Investment Category

The following table shows the gross unrealized gains and (losses) aggregated by investment category for available-for-sale investments:

As of December 31, 2022	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit	$	1	$	—	$	—	$	1
	$	1	$	—	$	—	$	1

As of December 31, 2022:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Estimated Fair Value
Long-term investments:
Available-for-sale investments:
Group insurance contracts	$	5	$	1	$	—	$	6

As of December 31, 2021:	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Estimated Fair Value
Short-term investments:
Available-for-sale investments:
Time deposits and certificates of deposit	$	22	$	—	$	—	$	22
Commercial paper		42		—		—		42
U.S. treasury obligations		11		—		—		11
U.S. agency obligations		1		—		—		1
	$	76	$	—	$	—	$	76

As of December 31, 2021	Cost		Gross Unrealized Gains		Gross Unrealized (Losses)		Estimated Fair Value
Long-term investments:
Available-for-sale investments:
Group insurance contracts	$	5	$	1	$	—	$	6