Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Basis of Presentation - Narrative (Details) - Corporate, Non-Segment [Member]	12 Months Ended
Dec. 31, 2021
Exelon significant subsidiaries
Schedule of Equity Method Investments [Line Items]
Percentage ownership of consolidated subsidiaries	100.00%
Commonwealth Edison Co [Member]
Schedule of Equity Method Investments [Line Items]
Percentage ownership of consolidated subsidiaries	99.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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