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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock Based Compensation Activity
The activity related to the Company’s restricted stock units (“RSUs”) consisted of (in thousands of shares):
 
 
Time-Based RSUs
 
Performance-Based and Market-Based RSUs
 
 
Number of Shares
 
Weighted
Average Grant Date
Fair Value
 
Number of Shares
 
Weighted
Average Grant Date
Fair Value
Outstanding at January 1, 2017 (a)
878

 
$
34.83

 
923

 
$
34.11

 
Granted
528

 
34.41

 
572

 
34.41

 
Vested (b)
(447
)
 
36.69

 
(146
)
 
36.55

 
Forfeited/expired
(50
)
 
32.49

 
(276
)
 
39.51

Outstanding at June 30, 2017 (c)
909

 
$
33.80

 
1,073

 
$
32.55

__________
(a) 
Reflects the maximum number of stock units assuming achievement of all time-, performance- and market-vesting criteria and does not include those for non-employee directors. The weighted-average fair value of time-based RSUs, and performance-based and market-based RSUs granted during the six months ended June 30, 2016 was $25.86 and $23.29, respectively.
(b) 
The total grant date fair value of RSUs vested during the six months ended June 30, 2017 and 2016 was $22 million and $25 million, respectively.
(c) 
The Company’s outstanding time-based RSUs, and performance-based and market-based RSUs had aggregate intrinsic values of $25 million and $29 million, respectively. Aggregate unrecognized compensation expense related to time-based RSUs, and performance-based and market-based RSUs, at target, amounted to $45 million and will be recognized over a weighted average vesting period of 1.5 years. The Company assumes that substantially all outstanding awards will vest over time.

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
 
Aggregate Intrinsic Value (in millions)
 
Weighted Average Remaining Contractual Term (years)
Outstanding at January 1, 2017
810

 
$
2.91

 
$
27

 
2.3
 
Granted
—

 
—

 
—

 
 
 
Exercised
(9
)
 
0.79

 
—

 
 
 
Forfeited/expired
—

 
—

 
—

 
 
Outstanding and exercisable at June 30, 2017
801

 
$
2.94

 
$
19

 
1.8