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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
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Schedule of Share Based Compensation Summary of Financial Statement Components Stock Options
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Schedule of Share-based Compensation, Stock Options, Activity
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Schedule of Share Based Compensation Summary of Financial Statement Components Restricted Stock Units Without Market Conditions
The following table summarizes the components of the Company's stock-based compensation related to its employee RSUs recognized in the Company's consolidated financial statements (in millions):
December 31,
 
2017
 
2016
 
2015
RSU expense before income tax
 
$
17

 
$
14

 
$
13

Tax benefit
 
(4
)
 
(4
)
 
(3
)
RSU expense, net of tax
 
$
13

 
$
10

 
$
10

Total value of RSUs converted (1)
 
$
10

 
$
7

 
$
16

Total fair value of RSUs vested
 
$
15

 
$
13

 
$
12

_____________________________
(1) 
Amount represents fair market value on the date of conversion.
Schedule of Share Based Compensation Restricted Stock Units Without Market Conditions Activity Table
A summary of the activity of RSUs for the year ended December 31, 2017 follows (RSUs in thousands):
 
 
RSUs
 
Weighted Average Grant Date Fair Values
 
Weighted Average Remaining Vesting Term
Non-vested at December 31, 2016
 
3,037

 
$
10.70

 
 
Vested
 
(1,337
)
 
11.37

 
 
Forfeited and expired
 
(280
)
 
10.94

 
 
Granted
 
1,546

 
11.93

 
 
Non-vested at December 31, 2017
 
2,966

 
$
11.02

 
1.4
Vested and expected to vest at December 31, 2017
 
2,711

 
$
11.01

 
 
Schedule of Share Based Compensation Restricted Stock Units Without Market Condition Vested And Converted
The following table summarizes the RSUs that vested and were converted during the periods indicated (RSUs in thousands):
Year Ended December 31,
 
2017
 
2016
 
2015
RSUs vested during the year
 
1,337

 
1,063

 
954

RSUs converted during the year, net of shares withheld for taxes
 
865

 
705

 
1,238

Shares withheld for taxes
 
472

 
358

 
549
Schedule of Share Based Compensation Summary of Financial Statement Components Restricted Stock Units With Market Conditions
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Schedule of Share Based Compensation Restricted Stock Units With Market Conditions Activity
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Schedule of Share Based Compensation Restricted Stock Units With Market Condition Vested and Converted