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Note 12. Stock-Based Compensation Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Market Performance Unit Award Valuation Assumptions
 
2016 RTSR PSU
Weighted average grant date fair value
$
27.99

Weighted average expected volatility
28.1
%
Weighted average volatility of XHB
19.4
%
Weighted average correlation coefficient
0.58

Weighted average risk-free interest rate
0.9
%
Weighted average dividend yield
—
Schedule of Nonvested Share Activity
A summary of RSU activity for the year ended December 31, 2016 is presented below (number of shares in millions):
 
Restricted Stock Units
 
Weighted Average Grant Date Fair Value
Unvested at January 1, 2016
1.0

 
$
46.36

Granted
1.0

 
32.29

Vested (a)
(0.5
)
 
45.84

Forfeited
(0.1
)
 
37.61

Unvested at December 31, 2016
1.4

 
$
37.53

_______________
(a)
The total fair value of RSUs which vested during the year ended December 31, 2016 was $23 million.
A summary of PSU activity for the year ended December 31, 2016 is presented below (number of shares in millions):
 
Performance Share Units
 
Weighted Average Grant Date Fair Value
Unvested at January 1, 2016
0.9

 
$
44.97

Granted (a)
0.6

 
31.89

Vested (b)
(0.4
)
 
44.27

Forfeited (c)
(0.1
)
 
46.69

Unvested at December 31, 2016
1.0

 
$
36.71

_______________
(a)
The PSU amounts granted in the table are shown at the target amount of the award.
(b)
The total fair value of PSUs which vested during the year ended December 31, 2016 was $15 million.
(c)
Includes the difference between PSU's granted at target and amounts earned.
Summary of Stock Options Valuation Assumptions
 
2016 Options
 
2015 Options
 
2014 Options
Weighted average grant date fair value
$
10.81

 
$
17.66

 
$
18.35

Weighted average expected volatility
31.7
%
 
36.1
%
 
41.5
%
Weighted average expected term (years)
6.25

 
6.25

 
6.25

Weighted average risk-free interest rate
1.3
%
 
1.6
%
 
1.4
%
Weighted average dividend yield
0.1
%
 
—

 
—
Summary of Stock Options Activity
A summary of stock option unit activity for the year ended December 31, 2016 is presented below (number of shares in millions):
 
Options
 
Weighted Average Exercise Price
Outstanding at January 1, 2016
3.2

 
$
31.42

Granted
0.3

 
32.33

Exercised (a) (b)
(0.1
)
 
19.86

Forfeited/Expired
(0.1
)
 
36.76

Outstanding at December 31, 2016 (c)
3.3

 
$
31.73

_______________
(a)
The intrinsic value of options exercised during the year ended December 31, 2016 was $1 million.
(b)
Cash received from options exercised during the year ended December 31, 2016 was $2 million.
(c)
Options outstanding at December 31, 2016 have an intrinsic value of $7 million and have a weighted average remaining contractual life of 6 years.
Summary of Exercisable Stock Options Activity
The following table summarizes information regarding exercisable stock options as of December 31, 2016:
Range of Exercise Prices
 
Options Vested (a)
 
Weighted Average Exercise Price
 
Aggregate Intrinsic Value
$15.00 to $50.00
 
2.63

 
$
26.48

 
$
6.7

$50.00 and above
 
0.09

 
$
140.86

 
$
—

_______________
(a)
Exercisable stock options as of December 31, 2016 have a weighted average remaining contractual life of 5.4 years.