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Other Financial Information - Other Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Other Financial Information [Abstract]    
Compensation and employee benefits $ 864 $ 599
Income taxes payable 598 287
Allowance for sales returns 587 137
Other accrued expenses 2,287 2,051
Total $ 4,336 $ 3,074