v3.22.0.1
Equity Awards (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Information About Outstanding And Vested Stock Options
A summary of stock option activity was as follows:
Number of
Shares 		Weighted-
Average
Exercise
Price Per Share		Weighted-
Average
Remaining
Contractual
Term 		Aggregate
Intrinsic Value
(in thousands)(in years)(in millions)
Outstanding at December 31, 20191,154 $77.70 
Exercised(621)$52.98 $199 
Canceled(11)$75.77 
Outstanding at December 31, 2020522 $107.14 
Granted (1)
1,052 $676.77 
Exercised(267)$59.60 $140 
Canceled(2)$84.24 
Outstanding at December 31, 20211,305 $551.39 8.8$157 
Vested and expected to vest as of December 31, 20211,037 $528.37 8.6$148 
Vested and exercisable as of December 31, 2021178 $92.06 3.7$99 
 (1) Includes awards assumed in business combinations
Restricted Stock Unit Table
A summary of RSU activity was as follows:
Number of
Shares 		Weighted-Average Grant-Date Fair Value Per Share
(in thousands)
Outstanding at December 31, 20198,733 $185.39 
Granted3,643 $367.52 
Vested(4,250)$181.85 
Forfeited(764)$221.84 
Outstanding at December 31, 20207,362 $274.23 
Granted2,912 577.26
Vested(3,653)$268.81 
Forfeited(813)354.42
Outstanding at December 31, 20215,808 $416.00 
Expected to vest as of December 31, 20215,209 
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions The following assumptions were used in the Black-Scholes options pricing model and the Monte Carlo simulation model, to estimate our stock-based compensation on the date of the grant for ESPP, stock options and PRSUs, respectively, as applicable.
 Year Ended December 31,
202120202019
Risk Free Interest Rate
ESPP
0.06% - 0.11%
0.11% - 2.04%
2.04% - 2.46%
Stock Options
1.20% - 1.45%
*1.80 %
PRSU
0.19% - 0.20%
****
Expected Term (in years)
ESPP0.50.50.5
Stock Options
7.5 - 10
*10
Expected Volatility
ESPP
35% - 60%
30% - 60%
30% - 49%
Stock Options
38% - 41%
*40 %
PRSU
41% - 42%
****
* There were no stock option grants in 2020.
** There were no grants with market conditions for the respective fiscal year.