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Accrued Liabilities
 9 Months Ended
Sep. 30, 2020
Accrued Liabilities [Abstract]  
Accrued liabilities Accrued Liabilities
Accrued liabilities consisted of the following:
(in millions)September 30, 2020December 31, 2019
Accounts payable non-trade$298 369 
Allowance for sales returns193 238 
Accrued compensation and benefits181 112 
Other289 326 
$961 1,045