Consolidated Balance Sheets - Exelon (Parentheticals) - USD ($) shares in Millions, $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Accumulated depreciation and amortization	$ 16,836	$ 15,930
Common stock (in dollars)	$ 0	$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares outstanding (in shares)	995	994
Treasury stock, common (in shares)	2	2