Investments (Tables)

9 Months Ended

Sep. 30, 2021

Debt Securities, Available-for-sale [Abstract]

Schedule of Marketable Debt Securities

The following is a summary of our available-for-sale debt securities recorded within short-term and long-term investments on the condensed consolidated balance sheets (in millions):

	September 30, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-sale securities:
Commercial paper	$	553	$	—	$	—	$	553
Corporate notes and bonds	2,261		4		(1)		2,264
Certificates of deposit	40		—		—		40
U.S. government and agency securities	97		—		—		97
Mortgage and asset backed securities	62		—		(1)		61
Total available-for-sale securities	$	3,013	$	4	$	(2)	$	3,015

	December 31, 2020
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Available-for-sale securities:
Commercial paper	$	406	$	—	$	—	$	406
Corporate notes and bonds	2,298		10		—		2,308
Certificates of deposit	23		—		—		23
U.S. government and agency securities	145		1		—		146
Total available-for-sale securities	$	2,872	$	11	$	—	$	2,883

Investments Classified by Contractual Maturity Date

The fair values of available-for-sale securities, by remaining contractual maturity, are as follows (in millions):

	September 30, 2021
Due within 1 year	$	1,631
Due in 1 year through 5 years	1,323
Instruments not due in single maturity	61
Total	$	3,015