Earnings Per Share and Equity (Tables)

3 Months Ended

Mar. 31, 2017

Earnings Per Share [Abstract]

Reconciliation of basic and diluted earnings per share

	Three Months Ended March 31,
	2017		2016
Exelon
Net income attributable to common shareholders	$	995	$	173
Weighted average common shares outstanding — basic	928		923
Assumed exercise and/or distributions of stock-based awards	2		2
Weighted average common shares outstanding — diluted	930		925