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Stock-Based Awards and Other Equity Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Restricted Stock Units Activity
The following table presents a summary of RSU activity:
 
RSUs
 
Weighted Average
Grant-Date Fair
Value
 
(In thousands)
 
 
Balance as of January 1, 2017
1,349

 
$
114.58

Granted
1,350

 
123.24

Vested
(492
)
 
115.29

Cancelled
(266
)
 
116.26

Balance as of December 31, 2017
1,941

 
120.19

Granted
1,821

 
107.37

Vested
(615
)
 
118.41

Cancelled
(386
)
 
113.55

Balance as of December 31, 2018
2,761

 
113.12

Granted
2,937

 
121.39

Vested
(952
)
 
114.33

Cancelled
(616
)
 
117.54

Balance as of December 31, 2019
4,130

 
117.05
Summary of Stock Option Activity
The following table presents a summary of our stock option activity:
 
Options
 
Weighted Average
Exercise Price
 
Remaining
Contractual Life
 
Aggregate
Intrinsic Value
 
(In thousands)
 
 
 
(In years)
 
(In millions)
Balance as of January 1, 2017
18,841

 
$
84.07

 
 
 
 
Granted
3,618

 
124.08

 
 
 
 
Exercised
(3,422
)
 
62.67

 
 
 
 
Cancelled
(3,384
)
 
96.86

 
 
 
 
Balance as of December 31, 2017
15,653

 
95.23

 
 
 
 
Granted
5,342

 
104.72

 
 
 
 
Exercised
(2,098
)
 
71.36

 
 
 
 
Cancelled
(1,197
)
 
107.26

 
 
 
 
Balance as of December 31, 2018
17,700

 
100.11

 
 
 
 
Granted
31

 
123.31

 
 
 
 
Exercised
(3,370
)
 
85.04

 
 
 
 
Cancelled
(1,246
)
 
111.31

 
 
 
 
Balance as of December 31, 2019
13,115

 
102.97

 
3.3
 
$
112

Exercisable as of December 31, 2019
7,559

 
98.75

 
2.5
 
94

Vested and expected to vest after December 31, 2019
13,115

 
102.97

 
3.3
 
112
Weighted Average Assumptions of Black-Scholes and Monte Carlo Option-Pricing Models The fair value of stock options granted during the years ended December 31, 2018 and 2017 were estimated at the date of grant using appropriate valuation techniques, including the Black-Scholes and Monte Carlo option-pricing models, assuming the following weighted average assumptions:
 
2018
 
2017
Risk-free interest rate
2.47
%
 
1.58
%
Expected volatility
32.81
%
 
32.47
%
Expected life (in years)
3.80

 
3.65

Dividend yield
1.11
%
 
0.92
%
Weighted-average estimated fair value of options granted during the year
$
24.97

 
$
30.17