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Common Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Stockholders' Equity Note [Abstract]  
Share repurchases

The following table summarizes the number of Common and Series A Common Shares issued and repurchased.

 

 

Common Shares

 

Series A Common Shares

 

Common Treasury Shares

(Shares in millions)

 

 

 

 

 

Balance at December 31, 2013

126 

 

7 

 

24 

 

Repurchase of shares

– 

 

– 

 

2 

 

Dividend reinvestment, incentive and compensation plans

– 

 

– 

 

(1)

Balance at December 31, 2014

126 

 

7 

 

25 

 

Dividend reinvestment, incentive and compensation plans

– 

 

– 

 

(1)

Balance at December 31, 2015

126 

 

7 

 

24 

 

Dividend reinvestment, incentive and compensation plans

– 

 

– 

 

(1)

Balance at December 31, 2016

126 

 

7 

 

23