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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 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
0.92

 
32.40

Vested (a)
(0.36
)
 
46.79

Forfeited
(0.02
)
 
39.70

Unvested at June 30, 2016
1.56

 
$
38.16

______________
(a)
The total fair value of RSUs which vested during the six months ended June 30, 2016 was $17 million.
A summary of PSU activity for the six months ended June 30, 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
0.64

 
32.05

Vested (b)
(0.03
)
 
46.45

Forfeited
—

 
—

Unvested at June 30, 2016
1.47

 
$
39.33

______________
(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 six months ended June 30, 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 six months ended June 30, 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 (a) (b)
(0.05
)
 
20.82

Forfeited/Expired
(0.02
)
 
33.42

Outstanding at June 30, 2016 (c)
3.38

 
$
31.68

______________
(a)
The intrinsic value of options exercised during the six months ended June 30, 2016 was $1 million.
(b)
Cash received from options exercised during the six months ended June 30, 2016 was $1 million.
(c)
Options outstanding at June 30, 2016 have an intrinsic value of $13 million and have a weighted average remaining contractual life of 6.4 years.