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Supplemental Financial Statement Information - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Other receivables	$ 594	$ 464
Other	861	751
Prepaid expenses and other current assets	$ 1,455	$ 1,215

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