Earnings Per Share and Equity (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share

	Three Months Ended June 30,				Six Months Ended June 30,
Exelon	2016		2015		2016		2015
Net income attributable to common shareholders	$	267	$	638	$	440	$	1,331
Weighted average common shares outstanding — basic	924		863		923		862
Assumed exercise and/or distributions of stock-based awards	2		3		3		4
Weighted average common shares outstanding — diluted	926		866		926		866