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Fair Value Measurements - Summary of Classification on Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities
Total	$ 6,970	$ 11,039
Cash and cash equivalents
Fair Value, Assets and Liabilities
Marketable equity securities	4,361	7,069
Prepaid and other current assets
Fair Value, Assets and Liabilities
Marketable equity securities	853	319
Other long-term assets
Fair Value, Assets and Liabilities
Marketable equity securities	$ 1,756	$ 3,651

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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 (a)
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- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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