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Revenue from Contracts with Customers (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020. 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.
20202021202220232024 and thereafterTotal
Exelon$92 $223 $93 $53 $370 $831 
Generation136 313 123 53 275 900 
PHI2 9 8 8 95 122 
Pepco2 7 6 6 75 96 
DPL— 1 1 1 10 13 
ACE— 1 1 1 10 13 
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, 2020 and 2019. The Utility Registrants do not have any contract assets.
ExelonGeneration
Balance as of December 31, 2019$174 $174 
Amounts reclassified to receivables(19)(19)
Revenues recognized17 17 
Balance at March 31, 2020$172 $172 
Amounts reclassified to receivables(26)(26)
Revenues recognized13 13 
Balance at June 30, 2020$159 $159 
Amounts reclassified to receivables(18)(18)
Revenues recognized19 19 
Balance at September 30, 2020$160 $160 
ExelonGeneration
Balance as of December 31, 2018$187 $187 
Amounts reclassified to receivables(26)(26)
Revenues recognized26 26 
Balance at March 31, 2019$187 $187 
Amounts reclassified to receivables(18)(18)
Revenues recognized27 27 
Balance at June 30, 2019$196 $196 
Amounts reclassified to receivables(65)(65)
Revenues recognized39 39 
Balance at September 30, 2019$170 $170 
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, 2020 and 2019. As of September 30, 2020 and December 31, 2019, ComEd's, PECO's, and BGE's contract liabilities were immaterial.
ExelonGenerationPHIPepcoDPLACE
Balance as of December 31, 2019$33 $71 $— $— $— $— 
Consideration received or due20 55 — — — — 
Revenues recognized(24)(70)— — — — 
Balance at March 31, 2020$29 $56 $— $— $— $— 
Consideration received or due13 34 — — — — 
Revenues recognized(22)(63)— — — — 
Balance at June 30, 2020$20 $27 $— $— $— $— 
Consideration received or due154 94 124 98 13 13 
Revenues recognized(25)(65)(2)(2)— — 
Balance at September 30, 2020$149 $56 $122 $96 $13 $13 
ExelonGenerationPHIPepcoDPLACE
Balance as of December 31, 2018$27 $42 $— $— $— $— 
Consideration received or due21 63 — — — — 
Revenues recognized(23)(66)— — — — 
Balance at March 31, 2019$25 $39 $— $— $— $— 
Consideration received or due17 52 — — — — 
Revenues recognized(21)(65)— — — — 
Balance at June 30, 2019$21 $26 $— $— $— $— 
Consideration received or due27 83 — — — — 
Revenues recognized(22)(61)— — — — 
Balance at September 30, 2019$26 $48 $— $— $— $— 
The following table reflects revenues recognized in the three and nine months ended September 30, 2020 and 2019, which were included in contract liabilities at December 31, 2019 and 2018, respectively:
Three Months Ended September 30,Nine Months Ended September 30,
2020201920202019
Exelon$2 $3 $25 $17 
Generation2 3 63 32