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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2022
Contract Asset/Liabilities [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]
The following table shows the amounts of future revenues expected to be recorded in each year for performance obligations that are unsatisfied or partially unsatisfied as of December 31, 2022. This disclosure only includes contracts for which the total consideration is fixed and determinable at contract inception. The average contract term varies by customer type and commodity but ranges from one month to several years.
This disclosure excludes the Utility Registrants' gas and electric tariff sales contracts and transmission revenue contracts as they generally have an original expected duration of one year or less and, therefore, do not contain any future, unsatisfied performance obligations to be included in this disclosure.
20232024202520262027 and thereafterTotal
Exelon$8 $6 $5 $5 $77 $101 
PHI8 6 5 5 77 101 
Pepco6 5 5 5 60 81 
DPL1 — — — 9 10 
ACE1 1 — — 8 10 
Contract Liabilities [Member]  
Contract Asset/Liabilities [Line Items]  
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] The following table provides a rollforward of the contract liabilities reflected in Exelon's, PHI's, Pepco's, DPL's, and ACE'S Consolidated Balance Sheets. As of December 31, 2022, 2021, and 2020, ComEd's, PECO's, and BGE's contract liabilities were not material.
Exelon(a)
PHI(a)
Pepco(a)
DPL(a)
ACE(a)
Balance as of December 31, 2020$118 $118 $94 $12 $12 
Revenues recognized(9)(9)(7)(1)(1)
Balance as of December 31, 2021109 109 87 11 11 
Revenues recognized(8)(8)(6)(1)(1)
Balance as of December 31, 2022$101 $101 $81 $10 $10 
__________(a)Revenues recognized in the years ended December 31, 2022 and 2021, were included in the contract liabilities at December 31, 2021 and 2020, respectively.