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Stock-Based Awards and Other Equity Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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, 2016
17,055

 
$
71.77

 
 
 
 
Granted
5,670

 
105.37

 
 
 
 
Exercised
(2,686
)
 
47.57

 
 
 
 
Cancelled
(1,198
)
 
91.62

 
 
 
 
Balance as of December 31, 2016
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

 
4.3
 
$
261

Exercisable as of December 31, 2018
7,192

 
88.02

 
2.9
 
185

Vested and expected to vest after December 31, 2018
17,700

 
100.11

 
4.3
 
261
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, 2017 and 2016 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
 
2016
Risk-free interest rate
2.47
%
 
1.58
%
 
0.97
%
Expected volatility
32.81
%
 
32.47
%
 
39.06
%
Expected life (in years)
3.8

 
3.65

 
3.59

Dividend yield
1.11
%
 
0.92
%
 
0.91
%
Weighted-average estimated fair value of options granted during the year
$
24.97

 
$
30.17

 
$
29.48
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, 2016
1,396

 
$
119.20

Granted
691

 
109.38

Vested
(516
)
 
118.71

Cancelled
(222
)
 
117.84

Balance as of December 31, 2016
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