Earnings Per Share and Equity (Tables)

9 Months Ended

Sep. 30, 2017

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 on the weighted average number of shares outstanding used in calculating diluted earnings per share: 

	Three Months Ended September 30,				Nine Months Ended September 30,
	2017		2016		2017		2016
Exelon
Net income attributable to common shareholders	$	824	$	490	$	1,899	$	930
Weighted average common shares outstanding — basic	962		925		941		924
Assumed exercise and/or distributions of stock-based awards	3		2		2		2
Weighted average common shares outstanding — diluted	965		927		943		926