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Marketable Securities - Current and Non-current (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale |  |
Current marketable securities | $ 112 | $ 201
Non-current marketable securities | 27 | 27
Total marketable securities | 139 | 228
Commercial paper |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 35 | 109
Certificates of deposit/time deposits |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 24 | 14
U.S. treasury securities |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 50 | 75
U.S. municipal securities |  |
Debt Securities, Available-for-sale |  |
Current marketable securities | 3 | 3
Non-current marketable securities | $ 27 | $ 27

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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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