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Revenue from Contracts with Customers Revenue from Contracts with Customers (Tables)
 12 Months Ended
Dec. 31, 2020
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, 2020, 2019 and 2018, which were included in contract liabilities at December 31, 2019, 2018, and 2017, respectively:
202020192018
Exelon$27 $18 $11 
Generation64 32 11 
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, 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.
20212022202320242025 and thereafterTotal
Exelon$262 $93 $54 $40 $330 $779 
Generation352 124 55 34 243 808 
PHI9 8 8 6 87 118 
Pepco7 6 6 5 70 94 
DPL1 1 1 — 9 12 
ACE1 1 1 1 8 12 
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 and Generation's Consolidated Balance Sheets. The Utility Registrants do not have any contract assets.
ExelonGeneration
Balance as of December 31, 2018$187 $187 
Amounts reclassified to receivables(143)(143)
Revenues recognized130 130 
Balance at December 31, 2019174 174 
Amounts reclassified to receivables(86)(86)
Revenues recognized68 68 
Contract assets reclassified as held for sale(a)
(12)(12)
Balance at December 31, 2020$144 $144 
__________
(a)Represents contract assets related to Generation's solar business, which were classified as held for sale as a result of the sale agreement. See Note 2 — Mergers, Acquisitions, and Dispositions for additional information.
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, Generation's, PHI's, Pepco's, DPL's, and ACE'S Consolidated Balance Sheets. As of December 31, 2020, 2019, and 2018, ComEd's, PECO's, and BGE's contract liabilities were immaterial.
ExelonGenerationPHIPepcoDPLACE
Balance as of December 31, 2017$35 $35 $— $— $— $— 
Consideration received or due179 465 — — — — 
Revenues recognized(187)(458)— — — — 
Balance as of December 31, 201827 42 — — — — 
Consideration received or due94 287 — — — — 
Revenues recognized(88)(258)— — — — 
Balance at December 31, 201933 71 — — — — 
Consideration received or due219 282 122 98 12 12 
Revenues recognized(98)(266)(4)(4)— — 
Contracts liabilities reclassified as held for sale(a)
(3)(3)— — — — 
Balance at December 31, 2020$151 $84 $118 $94 $12 $12 
__________
(a)Represents contract liabilities related to Generation's solar business, which were classified as held for sale as a result of the sale agreement. See Note 2 — Mergers, Acquisitions, and Dispositions for additional information.