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Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2021
Contract Asset/Liabilities [Line Items]  
Contract with Customer, Prior Year Contract Revenues Recognized in Current Year [Table Text Block]
The following table reflects revenues recognized in the years ended December 31, 2021, 2020 and 2019, which were included in contract liabilities at December 31, 2020, 2019, and 2018, respectively:
202120202019
Exelon$40 $27 $18 
PHI9 — — 
Pepco7 — — 
DPL1 — — 
ACE1 — — 
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, 2021. 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 Generation's power and gas sales contracts as they contain variable volumes and/or variable pricing. 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.
20222023202420252026 and thereafterTotal
Exelon$194 $70 $38 $31 $155 $488 
PHI8 8 6 5 82 109 
Pepco6 6 5 5 65 87 
DPL1 1 — — 9 11 
ACE1 1 1 — 8 11 
Contract Assets [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 assets reflected in Exelon's Consolidated Balance Sheets. The Utility Registrants do not have any contract assets.
Exelon
Balance as of December 31, 2019$174 
Amounts reclassified to receivables(86)
Revenues recognized68 
Contract assets reclassified as held-for-sale(12)
Balance as of December 31, 2020144 
Amounts reclassified to receivables(59)
Revenues recognized52 
Amounts previously held-for-sale12 
Balance as of December 31, 2021$149 
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, 2021, 2020, and 2019, ComEd's, PECO's, and BGE's contract liabilities were not material.
ExelonPHIPepcoDPLACE
Balance as of December 31, 2018$27 $— $— $— $— 
Consideration received or due94 — — — — 
Revenues recognized(88)— — — — 
Balance as of December 31, 201933 — — — — 
Consideration received or due219 122 98 12 12 
Revenues recognized(98)(4)(4)— — 
Contract liabilities reclassified as held-for-sale(3)— — — — 
Balance as of December 31, 2020151 118 94 12 12 
Consideration received or due97 — — — — 
Revenues recognized(110)(9)(7)(1)(1)
Amounts previously held-for-sale3 — — — — 
Balance as of December 31, 2021$141 $109 $87 $11 $11