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Financial Instruments and Fair Value Measurements - (Tables)

6 Months Ended

Jun. 30, 2021

Fair Value Disclosures [Abstract]

Summary of Financial Instruments by Significant Categories and Fair Value Measurement on a Recurring Basis

The following tables summarize our financial instruments by significant categories and fair value measurement on a recurring basis as of June 30, 2021 and December 31, 2020.

(in millions)			Level 1			Level 2			Total
June 30, 2021
Cash equivalents:
Money market mutual funds			$	3		$	—		3
Total cash equivalents			3			—			3
Investments:
Asset-backed securities			—			44			44
Corporate bonds			—			132			132
U.S. government agencies and government-sponsored agencies			—			3			3
U.S. treasuries			—			138			138
Other debt securities			—			8			8
Total investments			—			325			325
Restricted cash equivalents:
Money market mutual funds			94			—			94
Certificate of deposit			—			—			—
Commercial paper			—			—			—
Total restricted cash equivalents			94			—			94
Restricted investments:
Corporate bonds			—			37			37
U.S. government agencies and government-sponsored agencies			—			16			16
U.S. treasuries			—			177			177
Certificate of deposit			—			10			10
Total restricted investments			—			240			240
Total cash equivalents and investments and restricted cash equivalents and investments			$	97		$	565		$	662

(in millions)			Level 1			Level 2			Total
December 31, 2020
Cash equivalents
Money market mutual funds			$	2		$	—		$	2
U.S. treasuries			—			11			11
Total cash equivalents			2			11			13
Investments
Asset-backed securities			—			24			24
Corporate bonds			—			93			93
U.S. government agencies and government-sponsored agencies			—			5			5
U.S. treasuries			—			67			67
Other debt securities			—			6			6
Total investments			—			195			195
Restricted cash equivalents:
Money market mutual funds			99			—			99
Total restricted cash equivalents			99			—			99
Restricted investments:
Corporate bonds			—			35			35
U.S. government agencies and government-sponsored agencies			—			23			23
U.S. treasuries			—			198			198
Total restricted investments			—			256			256
Total investments and restricted cash equivalents and investments			$	101		$	462		$	563

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- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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