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Balance Sheet Components - Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Balance Sheet Components [Abstract]      
Allowance for doubtful accounts and authorized credits $ 115   $ 136
Allowance for doubtful accounts 80   $ 97
Decrease in allowance for doubtful accounts receivable 17    
Allowance for doubtful accounts receivable, write-offs 65    
Deferred revenue recognized $ 46 $ 64