Earnings Per Share and Equity Earnings Per Share and Equity (Policies)

9 Months Ended

Sep. 30, 2017

Earnings Per Share [Abstract]

Earnings Per Share, Policy [Policy Text Block]

Diluted earnings per share is calculated by dividing Net income attributable to common shareholders by the weighted average number of shares of common stock outstanding, including shares to be issued upon exercise of stock options, performance share awards and restricted stock outstanding under Exelon’s LTIPs considered to be common stock equivalents.