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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Summary of Activity Related to TEC Employee PSUs

 

A summary of the activity related to TEC employee PSUs for the year ended December 31, 2017 is presented in the following table:

 

 

 

 

 

 

 

Weighted

 

 

Aggregate

 

 

 

Number of

 

 

Average Grant

 

 

Intrinsic

 

 

 

Units

 

 

Date Fair Value

 

 

Value

 

 

 

(Thousands)

 

 

(Per Unit)

 

 

(Millions)

 

Outstanding as of December 31, 2016

 

 

0

 

 

$

0

 

 

$

0

 

Granted including DRIP

 

 

144

 

 

 

45.40

 

 

 

6

 

Exercised

 

 

(5

)

 

 

30.57

 

 

 

0

 

Forfeited

 

 

(17

)

 

 

45.41

 

 

 

(1

)

Transferred

 

 

11

 

 

 

38.51

 

 

 

1

 

Outstanding as of December 31, 2017

 

 

133

 

 

$

45.11

 

 

$

6