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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2021
Contracts with Customers [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 September 30, 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 also 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.
20212022202320242025 and thereafterTotal
Exelon$82 $125 $50 $35 $184 $476 
Generation168 281 92 41 97 679 
PHI2 8 8 6 87 111 
Pepco2 6 6 5 70 89 
DPL— 1 1 — 9 11 
ACE— 1 1 1 8 11 
Contract Assets [Member]  
Contracts with Customers [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 and Generation's Consolidated Balance Sheets for the three and nine months ended September 30, 2021 and 2020. The Utility Registrants do not have any contract assets.
ExelonGeneration
Balance as of December 31, 2020$144 $144 
Amounts reclassified to receivables(16)(16)
Revenues recognized13 13 
Amounts previously held-for-sale12 12 
Balance as of March 31, 2021153 153 
Amounts reclassified to receivables(12)(12)
Revenues recognized9 9 
Balance as of June 30, 2021150 150 
Amounts reclassified to receivables(15)(15)
Revenues recognized14 14 
Balance as of September 30, 2021$149 $149 
ExelonGeneration
Balance as of December 31, 2019$174 $174 
Amounts reclassified to receivables(19)(19)
Revenues recognized17 17 
Balance as of March 31, 2020172 172 
Amounts reclassified to receivables(26)(26)
Revenues recognized13 13 
Balance as of June 30, 2020159 159 
Amounts reclassified to receivables(18)(18)
Revenues recognized19 19 
Balance as of September 30, 2020$160 $160 
Contract Liabilities [Member]  
Contracts with Customers [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, Generation's, PHI's, Pepco's, DPL's, and ACE's Consolidated Balance Sheets for the three and nine months ended September 30, 2021 and 2020. As of September 30, 2021 and December 31, 2020, ComEd's, PECO's, and BGE's contract liabilities were immaterial.
ExelonGenerationPHIPepcoDPLACE
Balance as of December 31, 2020$151 $84 $118 $94 $12 $12 
Consideration received or due20 31 — — — — 
Revenues recognized(27)(64)(2)(2)— — 
Amounts previously held-for-sale3 3 — — — — 
Balance as of March 31, 2021147 54 116 92 12 12 
Consideration received or due17 39 — — — — 
Revenues recognized(32)(68)(3)(1)(1)(1)
Balance as of June 30, 2021132 25 113 91 11 11 
Consideration received or due31 93 — — — — 
Revenues recognized(26)(65)(2)(2)— — 
Balance as of September 30, 2021$137 $53 $111 $89 $11 $11 
ExelonGenerationPHIPepcoDPLACE
Balance as of December 31, 2019$33 $71 $— $— $— $— 
Consideration received or due20 55 — — — — 
Revenues recognized(24)(70)— — — — 
Balance as of March 31, 202029 56 — — — — 
Consideration received or due13 34 — — — — 
Revenues recognized(22)(63)— — — — 
Balance as of June 30, 202020 27 — — — — 
Consideration received or due154 94 124 98 13 13 
Revenues recognized(25)(65)(2)(2)— — 
Balance as of September 30, 2020$149 $56 $122 $96 $13 $13 
The following table reflects revenues recognized in the three and nine months ended September 30, 2021 and 2020, which were included in contract liabilities at December 31, 2020 and 2019, respectively:
Three Months Ended September 30,Nine Months Ended September 30,
2021202020212020
Exelon$4 $2 $38 $25 
Generation2 2 81 63 
PHI2 — 7 — 
Pepco2 — 5 — 
DPL— — 1 — 
ACE— — 1 —