Earnings Per Share and Equity (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share

	Three Months Ended September 30,				Nine Months Ended September 30,
Exelon	2016		2015		2016		2015
Net income attributable to common shareholders	$	490	$	629	$	930	$	1,959
Weighted average common shares outstanding — basic	925		913		924		879
Assumed exercise and/or distributions of stock-based awards	2		2		2		4
Weighted average common shares outstanding — diluted	927		915		926		883