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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 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 six months ended June 30, 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
1.1

 
28.19

Vested (a)
(0.6
)
 
39.58

Forfeited
(0.1
)
 
31.19

Unvested at June 30, 2017
1.8

 
$
31.36

______________
(a)
The total fair value of RSUs which vested during the six months ended June 30, 2017 was $25 million.
A summary of PSU activity for the six months ended June 30, 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

 
$
36.66

Granted
0.7

 
27.70

Vested
—

 
—

Forfeited
—

 
—

Unvested at June 30, 2017
1.7

 
$
32.71

______________
(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 six months ended June 30, 2017 is presented below (number of shares in millions):
 
Options
 
Weighted Average
Exercise Price
Outstanding at January 1, 2017
3.3

 
$
31.71

Granted
0.4

 
27.56

Exercised (a) (b)
(0.2
)
 
23.89

Forfeited/Expired
—

 
—

Outstanding at June 30, 2017 (c)
3.5

 
$
31.50

______________
(a)
The intrinsic value of options exercised during the six months ended June 30, 2017 was $1 million.
(b)
Cash received from options exercised during the six months ended June 30, 2017 was $5 million.
(c)
Options outstanding at June 30, 2017 have an intrinsic value of $6 million and have a weighted average remaining contractual life of 6 years.