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Stock-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary Of Share Based Payment Other Than Options Valuation Assumptions
 
Six Months Ended 
 June 30,
 
2014
 
2013
Expected volatility of stock price
40%
 
43%
Risk-free interest rate
0.83%
 
0.39%
Expected term of awards
3 years
 
3 years
Dividend yield
0.0%
 
0.0%
Stock Based Compensation Activity
The activity related to the Company’s restricted stock units (“RSUs”) and cash units, consisted of (in thousands of shares):
 
 
 
Time-Based RSUs
 
Performance-Based and Market-Based RSUs
 
Cash Unit Awards
 
 
Number of Shares
 
Weighted
Average Grant Date
Fair Value
 
Number of Shares
 
Weighted
Average Grant Date
Fair Value
 
Number of Units
 
Weighted
Average Grant Date
Fair Value
Outstanding at January 1, 2014 (a)
1,308

 
$
17.92

 
2,043

 
$
13.79

 
267

 
$
14.90

 
Granted
379

 
41.94

 
325

 
41.97

 
—

 
—

 
Vested (b)
(600
)
 
16.71

 
(432
)
 
10.91

 
—

 
—

 
Forfeited/expired
(57
)
 
23.62

 
(32
)
 
21.48

 
—

 
—

Outstanding at June 30, 2014 (c)
1,030

 
$
27.12

 
1,904

 
$
19.13

 
267

 
$
14.90

__________
(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, performance-based and market-based RSUs, and cash units granted in 2013 was $21.73, $20.64 and $17.14, respectively.
(b) 
The total grant date fair value of RSUs vested during the six months ended June 30, 2014 and 2013 was $15 million and $14 million, respectively.
(c) 
The Company’s outstanding time-based RSUs, performance-based and market-based RSUs, and cash units had aggregate intrinsic value of $61 million, $114 million and $16 million, respectively. Aggregate unrecognized compensation expense related to time-based RSUs and performance-based and market-based RSUs amounted to $41 million and will be recognized over a weighted average vesting period of 1.1 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, 2014
979

 
$
2.82

 
$
37

 
5.2
 
Granted
—

 
—

 
—

 

 
Exercised
(100
)
 
2.59

 
5

 

 
Forfeited/expired
—

 
—

 
—

 

Outstanding at June 30, 2014 (a)
879

 
2.85

 
50

 
4.7
Exercisable at June 30, 2014
847

 
$
2.52

 
$
48

 
4.7
__________ 
(a) 
The Company assumes that substantially all outstanding stock options will vest over time.