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Supplemental Financial Statement Information - Other Long-Term Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Deferred tax liabilities $ 454 $ 818
Other 675 488
Other long-term liabilities $ 1,129 $ 1,306