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Common Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Share repurchases
The following table summarizes the number of Common and Series A Common Shares issued.
 
Common Shares
 
Series A Common Shares
 
Common Treasury Shares
(Shares in millions)
 
 
 
 
 
Balance at December 31, 2015
126

 
7

 
24

Dividend reinvestment, incentive and compensation plans
—

 
—

 
(1
)
Balance at December 31, 2016
126

 
7

 
23

Dividend reinvestment, incentive and compensation plans
—

 
—

 
(1
)
Balance at December 31, 2017
126

 
7

 
22

Dividend reinvestment, incentive and compensation plans
—

 
—

 
(3
)
Balance at December 31, 2018
126

 
7

 
19