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Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of restricted stock activity
The following table summarizes the activities for our unvested Alphabet RSUs for the year ended December 31, 2020:
Unvested Restricted Stock Units
     Number of    
Shares		Weighted-
Average
Grant-Date
Fair Value
Unvested as of December 31, 201919,394,236 $1,055.22 
Granted12,647,562 1,407.97 
 Vested(11,643,670)1,089.31 
 Forfeited/canceled(1,109,335)1,160.01 
Unvested as of December 31, 202019,288,793 $1,262.13