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Earnings Per Share and Equity (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings per share

 
Three Months Ended June 30,

Six Months Ended June 30,
 
2017

2016

2017

2016
Exelon
 
 
 
 
 
 
 
Net income attributable to common shareholders
$
80

 
$
267

 
$
1,076

 
$
440

Weighted average common shares outstanding — basic
934

 
924

 
931

 
923

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

 
2

 
1

 
3

Weighted average common shares outstanding — diluted
936

 
926

 
932

 
926