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Marketable Securities - Current and Non-current (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale |  |
Current marketable securities | $ 855 | $ 404
Non-current marketable securities | 30 | 30
Total marketable securities | 885 | 434
Corporate debt securities |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 0 | 7
Commercial paper |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 501 | 237
Certificates of deposit/time deposits |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 45 | 31
U.S. treasury securities |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 305 | 125
U.S. municipal securities |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 4 | 4
Non-current marketable securities | $ 30 | $ 30

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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 + Details
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