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Jointly Owned Electric Utility Plant (Exelon, Generation, PECO, DPL and ACE)
 12 Months Ended
Dec. 31, 2020
Public Utilities, Property, Plant and Equipment [Abstract]  
Jointly Owned Electric Utility Plant (Exelon, Generation, PECO, DPL and ACE) Jointly Owned Electric Utility Plant (Exelon, Generation, PECO, DPL, and ACE)
Exelon's, Generation's, PECO's, DPL's, and ACE's material undivided ownership interests in jointly owned electric plants and transmission facilities at December 31, 2020 and 2019 were as follows:
Nuclear GenerationTransmission
Quad CitiesPeach
Bottom		SalemNine Mile Point Unit 2
NJ/DE(a)
OperatorGenerationGenerationPSEG
Nuclear		GenerationPSEG/DPL
Ownership interest75.00 %50.00 %42.59 %82.00 %various
Exelon’s share at December 31, 2020:
Plant in service$1,188 $1,506 $717 $990 $103 
Accumulated depreciation670 601 265 187 54 
Construction work in progress13 13 39 25 — 
Exelon’s share at December 31, 2019:
Plant in service$1,161 $1,466 $663 $951 $102 
Accumulated depreciation627 571 249 156 53 
Construction work in progress13 21 53 27 — 
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(a)PECO, DPL, and ACE own a 42.55%, 1%, and 13.9% share, respectively in 151.3 miles of 500kV lines located in New Jersey and of the Salem generating plant substation. PECO, DPL, and ACE also own a 42.55%, 7.45%, and 7.45% share, respectively, in 2.5 miles of 500kV line located over the Delaware River. ACE also has a 21.78% share in a 500kV New Freedom Switching substation.
Exelon’s, Generation’s, PECO's, DPL's, and ACE's undivided ownership interests are financed with their funds and all operations are accounted for as if such participating interests were wholly owned facilities. Exelon’s, Generation’s, PECO's, DPL's, and ACE's share of direct expenses of the jointly owned plants are included in Purchased power and fuel and Operating and maintenance expenses in Exelon’s and Generation’s Consolidated Statements of Operations and Comprehensive Income and in Operating and maintenance expenses in PECO's, PHI's, DPL's, and ACE's Consolidated Statements of Operations and Comprehensive Income.