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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Stock Options
The following is a summary of our stock option activity:
 
Number of Options
(in thousands)
 
Weighted Average
Exercise Price per
Option
Outstanding at January 1, 2016
3,873

 
$
31.93

Granted
752

 
50.01

Exercised
(746
)
 
28.73

Outstanding at December 31, 2016
3,879

 
36.05

Granted
731

 
57.34

Exercised
(597
)
 
27.97

Outstanding at December 31, 2017
4,013

 
41.13

Granted
535

 
67.23

Exercised
(908
)
 
34.84

Forfeited
(30
)
 
58.01

Outstanding at December 31, 2018
3,610

 
46.44
Schedule of Stock Options Outstanding
Details of stock options outstanding as of December 31, 2018 are as follows:
 
Number of Options
(in thousands)
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining
Contractual Life
(Years)
 
Aggregate
Intrinsic
Value
(In millions)
Vested or expected to vest
3,610

 
$
46.44

 
6.2
 
$
104

 
Number of Options
(in thousands)
 
Weighted Average
Exercise Price
 
Weighted Average
Remaining
Contractual Life
(Years)
 
Aggregate
Intrinsic
Value
(In millions)
Exercisable
2,596

 
$
40.22

 
5.4
 
$
91
Schedule of Stock Options Valuation Assumptions
During 2018, 2017 and 2016, we used the assumptions in the table below to compute the value:
 
 
Year Ended December 31,
Assumptions
 
2018
 
2017
 
2016
Risk-free interest rate
 
2.67
%
 
1.84
%
 
1.51
%
Expected life in years
 
6.0

 
5.0

 
5.0

Expected volatility
 
20
%
 
21
%
 
24
%
Expected dividend yield
 
1.43
%
 
1.40
%
 
1.36
%
Estimated weighted-average fair value of options granted per share
 
$
14.08

 
$
10.50

 
$
9.88
Schedule of Nonvested Restricted Stock Options
The following is a summary of the nonvested restricted shares under all plans discussed above in 2018, 2017 and 2016:  
 
Number of
Restricted
Stock Shares
(in thousands)
 
Weighted Average
Grant-Date Fair
Value per Share
Nonvested at January 1, 2016
6,271
 
$
39.99

Granted
3,251
 
50.06

Vested
(2,640)
 
38.05

Forfeited
(446)
 
45.51

Nonvested at December 31, 2016
6,436
 
45.86

Granted
3,274
 
57.61

Vested
(3,509)
 
44.64

Forfeited
(453)
 
52.38

Nonvested at December 31, 2017
5,748
 
52.78

Granted
1,921
 
67.92

Vested
(2,819)
 
50.21

Forfeited
(453)
 
58.42

Nonvested at December 31, 2018
4,397
 
60.45