Consolidated Balance Sheets - Exelon (Parentheticals) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accumulated depreciation and amortization	$ 17,251	$ 15,930
Common Stock, No Par Value	$ 0	$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares, outstanding (in shares)	999	994
Treasury Stock, Common, Shares	2	2