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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2017
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

Granted
493

 
76.16

Exercised
(598
)
 
38.96

Forfeited
(4
)
 
77.58

Outstanding at December 31, 2019
3,501

 
51.87
Schedule of Stock Options Outstanding And Exercised
Details of stock options outstanding as of December 31, 2019 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
3,501

 
$
51.87

 
5.9
 
$
142

Exercisable
2,445

 
$
44.35

 
4.9
 
$
118


Details of stock options exercised during 2019, 2018 and 2017 are as follows:
 
 
Year Ended December 31,
Options exercised:
 
2019
 
2018
 
2017
Total intrinsic value of options exercised (in millions)
 
$
26

 
$
36

 
$
22


 
 
As of December 31,
Options outstanding:
 
2019

 
2018
 
2017
Number of options exercisable (in millions)
 
2.4

 
2.6

 
3.0

Weighted-average exercise price
 
$
44.35

 
$
40.22

 
$
36.36
Schedule of Stock Options Valuation Assumptions During 2019, 2018 and 2017, we used the assumptions in the table below to compute the value:
 
 
Year Ended December 31,
Assumptions:
 
2019
 
2018
 
2017
Risk-free interest rate
 
2.49
%
 
2.67
%
 
1.84
%
Expected life in years
 
5.9

 
6.0

 
5.0

Expected volatility
 
20
%
 
20
%
 
21
%
Expected dividend yield
 
1.44
%
 
1.43
%
 
1.40
%
Estimated weighted-average fair value of options granted per share
 
$
15.45

 
$
14.08

 
$
10.50
Schedule of Nonvested Restricted Stock Options
The following is a summary of nonvested restricted shares under all plans discussed above:  
 
Number of
Restricted
Stock Shares
(in thousands)
 
Weighted Average
Grant-Date Fair
Value per Share
Nonvested at January 1, 2017
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
1,994
 
67.88


 
Number of
Restricted
Stock Shares
(in thousands)
 
Weighted Average
Grant-Date Fair
Value per Share
Vested
(2,819)
 
50.21

Forfeited
(453)
 
58.42

Nonvested at December 31, 2018
4,470
 
60.56

Granted
1,697
 
76.85

Vested
(2,269)
 
57.92

Forfeited
(231)
 
67.66

Nonvested at December 31, 2019
3,667
 
69.29


 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
Time-based restricted stock units granted
(in thousands) (1)
 
997

 
1,153

 
2,364

Total fair value of restricted stock vested under all restricted stock plans
(in millions)
 
$
173

 
$
206

 
$
206

(1) The remaining shares granted are performance-based.