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Accrued Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accrued Liabilities [Abstract]    
Accounts payable non-trade $ 271 $ 408
Allowance for sales returns 186 267
Accrued compensation and benefits 147 214
Other 279 413
Accrued liabilities $ 883 $ 1,302