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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