Document and Entity Information Document
Jan. 06, 2022
Document Information [Line Items]  
Document Type 8-K
Document Period End Date Jan. 06, 2022
Entity File Number 001-16169
Entity Registrant Name EXELON CORPORATION
Entity Tax Identification Number 23-2990190
Entity Incorporation, State or Country Code PA
Entity Address, Address Line One 10 South Dearborn Street
Entity Address, Address Line Two P.O. Box 805379
Entity Address, City or Town Chicago
Entity Address, State or Province IL
Entity Address, Postal Zip Code 60680-5379
City Area Code (800)
Local Phone Number 483-3220
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, without par value
Trading Symbol EXC
Security Exchange Name NASDAQ
Entity Central Index Key 0001109357
Amendment Flag false
Entity Emerging Growth Company false
Constellation Energy Co [Member]  
Document Information [Line Items]  
Entity File Number 001-41137
Entity Registrant Name CONSTELLATION ENERGY CORPORATION
Entity Tax Identification Number 87-1210716
Entity Incorporation, State or Country Code PA
Entity Address, Address Line One 1310 Point Street
Entity Address, City or Town Baltimore
Entity Address, State or Province MD
Entity Address, Postal Zip Code 21231
City Area Code (800)
Local Phone Number 483-3220
Title of 12(b) Security Common Stock, without par value
Trading Symbol CEG
Security Exchange Name NASDAQ
Entity Central Index Key 0001868275
Exelon Generation Co L L C [Member]  
Document Information [Line Items]  
Entity File Number 333-85496
Entity Registrant Name EXELON GENERATION COMPANY, LLC
Entity Tax Identification Number 23-3064219
Entity Incorporation, State or Country Code PA
Entity Address, Address Line One 300 Exelon Way
Entity Address, City or Town Kennett Square
Entity Address, State or Province PA
Entity Address, Postal Zip Code 19348-2473
City Area Code (610)
Local Phone Number 765-5959
Entity Central Index Key 0001168165