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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Market Performance Unit Award Valuation Assumptions
 
2016 RTSR PSU
Grant date fair value
$
28.15

Expected volatility
28.1
%
Volatility of XHB
19.4
%
Correlation coefficient
0.58

Risk-free interest rate
0.9
%
Dividend yield

Schedule of Nonvested Share Activity
A summary of RSU activity for the three months ended March 31, 2016 is presented below (number of shares in millions):
 
Restricted
Stock Units
 
Weighted
Average
Grant Date
Fair Value
Unvested at January 1, 2016
1.02

 
$
46.36

Granted
0.77

 
32.65

Vested (a)
(0.33
)
 
46.84

Forfeited

 

Unvested at March 31, 2016
1.46

 
$
39.04

______________
(a)
The total fair value of RSUs which vested during the three months ended March 31, 2016 was $15 million.
A summary of PSU activity for the three months ended March 31, 2016 is presented below (number of shares in millions):
 
Performance Share Units (a)
 
Weighted
Average
Grant Date
Fair Value
Unvested at January 1, 2016
0.86

 
$
44.97

Granted
0.21

 
28.15

Vested (b)
(0.03
)
 
46.47

Forfeited

 

Unvested at March 31, 2016
1.04

 
$
41.51

______________
(a)
The PSU amounts in the table are shown at the target amount of the award.
(b)
The total fair value of PSUs which vested during the three months ended March 31, 2016 was $1 million.
Summary of Stock Options Valuation Assumptions
 
2016 Options
Grant date fair value
$
10.97

Expected volatility
31.7
%
Expected term (years)
6.25

Risk-free interest rate
1.3
%
Dividend yield

Summary of Stock Options Activity
A summary of stock option unit activity for the three months ended March 31, 2016 is presented below (number of shares in millions):
 
Options
 
Weighted
Average
Exercise
Price
Outstanding at January 1, 2016
3.15

 
$
31.42

Granted
0.30

 
32.63

Exercised
(0.01
)
 
20.77

Forfeited/Expired
(0.01
)
 
32.28

Outstanding at March 31, 2016 (a)
3.43

 
$
31.55

______________
(a)
Options outstanding at March 31, 2016 have an intrinsic value of $31 million and have a weighted average remaining contractual life of 6.7 years.