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Employee Stock Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Status of Senior Executive Plans

The following table is a summary of the status of our senior executive plans for the three years ended December 31, 2016:

 

 

 

Year ended December 31,

 

 

 

2016

 

 

2015

 

 

2014

 

 

 

Shares

 

 

Fair Value

 

 

Shares

 

 

Fair Value

 

 

Shares

 

 

Fair Value

 

 

 

(in millions)

 

 

(per share)

 

 

(in millions)

 

 

(per share)

 

 

(in millions)

 

 

(per share)

 

Balance, at beginning of year

 

 

—

 

 

$

—

 

 

 

—

 

 

$

—

 

 

 

—

 

 

$

—

 

Granted

 

 

1.6

 

 

 

18

 

 

 

1.3

 

 

 

16

 

 

 

1.5

 

 

 

18

 

Vested (1)

 

 

(0.6

)

 

 

19

 

 

 

(0.4

)

 

 

15

 

 

 

(0.8

)

 

 

24

 

Forfeited/expired

 

 

(1.0

)

 

 

19

 

 

 

(0.9

)

 

 

15

 

 

 

(0.7

)

 

 

24

 

Balance, at end of year

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

 

 

—

 

Issued in calendar year (1)

 

 

0.2

 

 

 

15

 

 

 

0.5

 

 

 

24

 

 

 

0.4

 

 

 

19

 

___________

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

(1)

Shares that vest at December 31 of each year are issued to the employees in the first quarter of the following year, although the requisite service period is complete. Accordingly, the 0.2 million shares issued in 2016 include shares vested at December 31, 2015, after adjusting for shares withheld to meet employee tax requirements. The shares withheld for employee tax requirements were valued at $2.4 million, $9.8 million and $6.1 million for 2016, 2015 and 2014, respectively.