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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation Activity
The Company recorded stock-based compensation expense of $7 million and $4 million ($5 million and $3 million, net of tax) during the three months ended June 30, 2018 and 2017, respectively, and $12 million and $5 million ($9 million and $3 million, net of tax) during the six months ended June 30, 2018 and 2017, respectively.

The activity related to restricted stock units (“RSUs”) consisted of (in thousands of shares):
 
 
 
Number of Shares
 
Weighted
Average
Grant Date
Fair Value
 
Weighted Average Remaining Contractual Term (years)
 
Aggregate Intrinsic Value (in millions)
Time-based RSUs
 
 
 
 
 
 
 
 
Outstanding at January 1, 2018
1,160

 
$
34.54

 
 
 
 
 
 
Granted (a)
317

 
48.66

 
 
 
 
 
 
Vested (b)
(359
)
 
35.14

 
 
 
 
 
 
Forfeited
(39
)
 
34.98

 
 
 
 
 
Outstanding and expected to vest at June 30, 2018(c)
1,079

 
$
38.47

 
1.1
 
$
35

Performance-based and market-based RSUs
 
 
 
 
 
 
 
 
Outstanding at January 1, 2018
994

 
$
33.06

 
 
 
 
 
 
Granted (a)
349

 
48.72

 
 
 
 
 
 
Vested
—

 
—

 
 
 
 
 
 
Forfeited
(145
)
 
53.36

 
 
 
 
 
Outstanding at June 30, 2018
1,198

 
$
35.17

 
1.5
 
$
39

 
Outstanding and expected to vest at June 30, 2018(c)
266

 
$
44.49

 
2.3
 
$
9

__________
(a) 
Reflects the maximum number of stock units assuming achievement of all performance-, market- and time-vesting criteria and does not include those for non-employee directors. The weighted-average fair value of time-based RSUs and performance-based RSUs granted during the six months ended June 30, 2017 was $34.41.
(b) 
The total fair value of RSUs vested during June 30, 2018 and 2017 was $13 million and $22 million, respectively.
(c) 
Aggregate unrecognized compensation expense related to time-based RSUs and performance-based RSUs amounted to $41 million and will be recognized over a weighted average vesting period of 1.3 years.
Summary Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range
The stock option activity consisted of (in thousands of shares):
 
 
Number of Options
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining Contractual Term (years)
 
Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2018
273

 
$
7.08

 
1.7
 
$
10

 
Granted
—

 
—

 
 
 


 
Exercised
(186
)
 
9.99

 
 
 
7

 
Forfeited/expired
—

 
—

 
 
 


Outstanding and exercisable at June 30, 2018
87

 
$
0.79

 
0.6
 
$
3