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Supplemental Financial Statement Information - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Other receivables | $ 533 | $ 464
Other | 722 | 751
Prepaid expenses and other current assets | $ 1,255 | $ 1,215

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