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Intangibles Intangibles (Exelon and Generation)
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets Disclosure [Text Block]
Intangible Assets (Exelon and PHI)
In the third quarter of 2015, PHI entered into a sponsorship agreement with the District of Columbia for future sponsorship rights associated with public property within the District of Columbia and paid the District of Columbia $25 million. The specific sponsorship rights were to be determined over time through future negotiations. As of March 31, 2018, PHI has recorded the sponsorship agreement as a finite-lived intangible asset with a $25 million carrying amount.