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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Market Performance Unit Award Valuation Assumptions
 
2017 RTSR PSU
Weighted average grant date fair value
$
27.98

Weighted average expected volatility
29.0
%
Weighted average volatility of XHB
18.4
%
Weighted average correlation coefficient
0.53

Weighted average risk-free interest rate
1.5
%
Weighted average dividend yield

Schedule of Nonvested Share Activity
A summary of RSU activity for the three months ended March 31, 2017 is presented below (number of shares in millions):
 
Restricted
Stock Units
 
Weighted Average Grant Date Fair Value
Unvested at January 1, 2017
1.4

 
$
37.53

Granted
0.9

 
27.69

Vested (a)
(0.5
)
 
40.63

Forfeited

 

Unvested at March 31, 2017
1.8

 
$
31.41

______________
(a)
The total fair value of RSUs which vested during the three months ended March 31, 2017 was $23 million.
A summary of PSU activity for the three months ended March 31, 2017 is presented below (number of shares in millions):
 
Performance Share Units (a)
 
Weighted Average Grant Date Fair Value
Unvested at January 1, 2017
1.0

 
$
36.71

Granted
0.7

 
27.70

Vested

 

Forfeited

 

Unvested at March 31, 2017
1.7

 
$
32.74

______________
(a)
The PSU amounts in the table are shown at the target amount of the award.
Summary of Stock Options Valuation Assumptions
 
2017 Options
Weighted average grant date fair value
$
8.00

Weighted average expected volatility
30.7
%
Weighted average expected term (years)
6.25

Weighted average risk-free interest rate
2.1
%
Weighted average dividend yield
1.3
%
Summary of Stock Options Activity
A summary of stock option unit activity for the three months ended March 31, 2017 is presented below (number of shares in millions):
 
Options
 
Weighted Average
Exercise Price
Outstanding at January 1, 2017
3.3

 
$
31.73

Granted
0.4

 
27.56

Exercised

 

Forfeited/Expired

 

Outstanding at March 31, 2017 (a)
3.7

 
$
31.31

______________
(a)
Options outstanding at March 31, 2017 have an intrinsic value of $7 million and have a weighted average remaining contractual life of 6.2 years.