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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
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 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, 2017

 

 

133

 

 

$

45.11

 

 

$

6

 

Granted including DRIP

 

 

130

 

 

 

47.98

 

 

 

6

 

Exercised

 

 

(4

)

 

 

38.85

 

 

 

(1

)

Forfeited

 

 

(1

)

 

 

45.41

 

 

 

0

 

Outstanding as of December 31, 2018

 

 

258

 

 

$

46.68

 

 

$

11