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v3.20.2

Subsequent Events (Narrative) (Details) - Subsequent event customer in Millions, $ in Millions | Oct. 29, 2020 USD ($) customer
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Subsequent Event [Line Items] |
Customer power outages | customer | 1
Estimated storm costs, expected not to exceed | $ | $ 100

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- Definition Estimated Storm Costs - Capital and Operation Maintenance + References No definition available. + Details
Name: | duk_EstimatedStormCostsCapitalandOperationMaintenance
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Power Outage, Number + References No definition available. + Details
Name: | duk_PowerOutageNumber
Namespace Prefix: | duk_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |