Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Balance Sheet - Parenthetical (Details) - $ / shares	Dec. 31, 2019	Dec. 31, 2018
Common stock, par value	$ 0	$ 0
Common Stock, Shares Authorized	2,000,000,000	2,000,000,000
Common Stock, Shares, Outstanding	973,000,000	968,000,000
Treasury stock, shares held	2,000,000	2,000,000
Exelon Corporate [Member]
Common stock, par value	$ 0	$ 0
Common Stock, Shares Authorized	2,000,000,000	2,000,000,000
Treasury stock, shares held	2,000,000	2,000,000