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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Assumptions Used in Options Pricing Model The assumptions pertaining to options issued during 2018, 2017, and 2016 are shown in the following table.
Year ended December 31,
2018
2017
2016
Average option life
6.5 years

6.0 years

6.0 years

Future dividend yield
2.28
%
1.79
%
2.86
%
Historical share price volatility
.282

.287

.297

Weighted-average risk-free interest rate
2.8
%
2.1
%
1.3
%
Activity, Pricing and Other Information for Stock Options The following table summarizes activity, pricing and other information for our stock options for the year ended December 31, 2018:
 
Number of
Options
Weighted-Average
Exercise Price Per
Option
Weighted-Average
Remaining Life
Aggregate
Intrinsic
Value(a)
Outstanding at December 31, 2017
9,882,617

$
11.28

5.5 years
$
88

Granted
346,088

21.02

 
 
Exercised
(1,960,444
)
10.12

 
 
Lapsed or canceled
(144,417
)
14.37

 
 
Outstanding at December 31, 2018
8,123,844

$
11.92

5.3
31

 
 
 
 
 
Expected to vest
2,508,684

15.09

7.6
5

Exercisable at December 31, 2018
5,479,638

$
10.36

4.2
$
26


(a)
The intrinsic value of a stock option is the amount by which the fair value of the underlying stock exceeds the exercise price of the option.
Activity and Pricing Information for Nonvested Shares in Long-Term Incentive Compensation Program The following table summarizes activity and pricing information for the nonvested shares in the Program for the year ended December 31, 2018.
 
Vesting Contingent on
Service Conditions
 
Vesting Contingent on
Performance and Service
Conditions
  
Number of
Nonvested
Shares
Weighted-
Average
Grant-Date
Fair Value
 
Number of
Nonvested
Shares
Weighted-
Average
Grant-Date
Fair Value
Outstanding at December 31, 2017
11,832,956

$
14.05

 
4,148,020

$
17.51

Granted
4,076,746

21.02

 
1,588,738

14.83

Vested
(5,404,616
)
13.61

 
(1,070,112
)
17.73

Forfeited
(930,136
)
17.01

 
(127,191
)
19.42

Outstanding at December 31, 2018
9,574,950

$
16.84

 
4,539,455

$
14.35

 
 
 
 
 
 
Activity and Pricing Information for Nonvested Shares Granted Under Deferred Compensation Plans and Other Restricted Stock Awards The following table summarizes activity and pricing information for the nonvested shares granted under our deferred compensation plans and these other restricted stock or unit award programs for the year ended December 31, 2018.
 
Number of
Nonvested
Shares
Weighted-Average
Grant-Date
Fair Value
Outstanding at December 31, 2017
4,223,774

$
15.61

Granted
724,287

20.77

Dividend equivalents
18

20.03

Vested
(1,523,387
)
14.43

Forfeited
(144,875
)
14.18

Outstanding at December 31, 2018
3,279,817

$
17.36