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Earnings Per Share and Equity (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings per share
The following table sets forth the components of basic and diluted earnings per share and shows the effect of these stock options, performance share awards and restricted stock awards on the weighted average number of shares outstanding used in calculating diluted earnings per share: 
 
Three Months Ended March 31,
 
2018

2017
Exelon
 
 
 
Net income attributable to common shareholders
$
585

 
$
990

Weighted average common shares outstanding — basic
966

 
928

Assumed exercise and/or distributions of stock-based awards
2

 
2

Weighted average common shares outstanding — diluted
968

 
930