0001109357 2021-10-01 2021-10-01 0001109357 exc:ExelonGenerationCoLLCMember 2021-10-01 2021-10-01 0001109357 exc:CommonwealthEdisonCoMember 2021-10-01 2021-10-01 0001109357 dei:FormerAddressMember exc:CommonwealthEdisonCoMember 2021-10-01 2021-10-01 PA 10 South Dearborn Street P.O. Box 805379 Chicago IL 60680-5379 (800) 483-3220 PA 300 Exelon Way Kennett Square PA 19348-2473 (610) 765-5959 IL 10 South Dearborn Street 49th Floor Chicago IL 60603 (312) 394-4321 IL 440 South LaSalle Street Chicago IL 60605-1028 (312) 394-4321 false 0001109357 0001168165 0000022606 false 8-K 2021-10-01 001-16169 EXELON CORPORATION 23-2990190 PA 10 South Dearborn Street P.O. Box 805379 Chicago IL 60680-5379 (800) 483-3220 333-85496 EXELON GENERATION COMPANY, LLC 23-3064219 PA 300 Exelon Way Kennett Square PA 19348-2473 (610) 765-5959 001-01839 COMMONWEALTH EDISON COMPANY 36-0938600 IL 10 South Dearborn Street 49th Floor Chicago IL 60603 (312) 394-4321 COMMONWEALTH EDISON COMPANY IL 440 South LaSalle Street Chicago IL 60605-1028 (312) 394-4321 false false false false Common Stock, without par value EXC NASDAQ false