Asset Impairments (Exelon and BGE) - Narrative (Details) - Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses $ in Millions	12 Months Ended
Dec. 31, 2022 USD ($)
Property, Plant and Equipment [Line Items]
Asset impairment charges	$ 48
Baltimore Gas and Electric Company
Property, Plant and Equipment [Line Items]
Asset impairment charges	$ 48

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-4

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration