Consolidated Balance Sheets - ComEd (Parentheticals) - USD ($) shares in Millions, $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Aug. 04, 2022
Accumulated depreciation and amortization	$ 17,251	$ 15,930
Common stock (in usd per share)			$ 0
Common stock, shares authorized (in shares)	2,000	2,000
Common stock, shares, outstanding (in shares)	999	994
Commonwealth Edison Co
Accumulated depreciation and amortization	$ 7,222	$ 6,673
Common stock (in usd per share)	$ 12.50	$ 12.50
Common stock, shares authorized (in shares)	250	250
Common stock, shares, outstanding (in shares)	127	127