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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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,
 
2018
 
2017
 
2016
RSU expense before income tax
 
$
11

 
$
17

 
$
14

Tax benefit
 
(2
)
 
(4
)
 
(4
)
RSU expense, net of tax
 
$
9

 
$
13

 
$
10

Total value of RSUs converted (1)
 
$
10

 
$
10

 
$
7

Total fair value of RSUs vested
 
$
16

 
$
15

 
$
13

_____________________________
(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, 2018 follows (RSUs in thousands):
 
 
RSUs
 
Weighted Average Grant Date Fair Values
 
Weighted Average Remaining Vesting Term
Nonvested at December 31, 2017
 
2,966

 
$
11.02

 
 
Vested
 
(1,428
)
 
11.05

 
 
Forfeited and expired
 
(528
)
 
10.95

 
 
Granted
 
913

 
10.55

 
 
Nonvested at December 31, 2018
 
1,923

 
$
10.80

 
1.4
Vested and expected to vest at December 31, 2018
 
1,782

 
$
10.79

 
 
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,
 
2018
 
2017
 
2016
RSUs vested during the year
 
1,428

 
1,337

 
1,063

RSUs converted during the year, net of shares withheld for taxes
 
950

 
865

 
705

Shares withheld for taxes
 
478

 
472

 
358