XML 278 R79.htm IDEA: XBRL DOCUMENT
v3.24.3

Revenue from Contracts with Customers - Change in Contract with Customer, Asset and Liability (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023
Contract Liabilities [Roll Forward] |  |  |  |  |  |
Beginning Balance - Contract Liabilities | $ 130 | $ 131 | $ 133 | $ 98 | $ 100 | $ 101
Revenues recognized | (2) | (1) | (2) | (2) | (2) | (1)
Ending Balance - Contract Liabilities | 128 | 130 | 131 | 96 | 98 | 100
Pepco Holdings LLC |  |  |  |  |  |
Contract Liabilities [Roll Forward] |  |  |  |  |  |
Beginning Balance - Contract Liabilities | 130 | 131 | 133 | 98 | 100 | 101
Revenues recognized | (2) | (1) | (2) | (2) | (2) | (1)
Ending Balance - Contract Liabilities | 128 | 130 | 131 | 96 | 98 | 100
Potomac Electric Power Company |  |  |  |  |  |
Contract Liabilities [Roll Forward] |  |  |  |  |  |
Beginning Balance - Contract Liabilities | 104 | 105 | 107 | 78 | 80 | 81
Revenues recognized | (2) | (1) | (2) | (1) | (2) | (1)
Ending Balance - Contract Liabilities | 102 | 104 | 105 | 77 | 78 | 80
Delmarva Power and Light Company |  |  |  |  |  |
Contract Liabilities [Roll Forward] |  |  |  |  |  |
Beginning Balance - Contract Liabilities | 13 | 13 | 13 | 10 | 10 | 10
Revenues recognized | 0 | 0 | 0 | 0 | 0 | 0
Ending Balance - Contract Liabilities | 13 | 13 | 13 | 10 | 10 | 10
Atlantic City Electric Company |  |  |  |  |  |
Contract Liabilities [Roll Forward] |  |  |  |  |  |
Beginning Balance - Contract Liabilities | 13 | 13 | 13 | 10 | 10 | 10
Revenues recognized | 0 | 0 | 0 | (1) | 0 | 0
Ending Balance - Contract Liabilities | $ 13 | $ 13 | $ 13 | $ 9 | $ 10 | $ 10

X
- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
Name: | us-gaap_ContractWithCustomerLiabilityCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 + Details
Name: | us-gaap_ContractWithCustomerLiabilityRevenueRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInDeferredRevenueRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=exc_PepcoHoldingsLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=exc_PotomacElectricPowerCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=exc_DelmarvaPowerandLightCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=exc_AtlanticCityElectricCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |