Earnings Per Share and Equity (Tables)

3 Months Ended

Mar. 31, 2016

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share

	Three Months Ended March 31,
Exelon	2016		2015
Net income attributable to common shareholders	$	173	$	693
Weighted average common shares outstanding — basic	923		862
Assumed exercise and/or distributions of stock-based awards	2		5
Weighted average common shares outstanding — diluted	925		867