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Summary of Significant Accounting Policies (Payables) (Details) $ in Millions | Dec. 31, 2020 USD ($)
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Payables [Line Items] |
Payables sold by suppliers | $ 15
Cumulative payables sold by suppliers | 45
Duke Energy Ohio |
Payables [Line Items] |
Payables sold by suppliers | 1
Cumulative payables sold by suppliers | 9
Piedmont |
Payables [Line Items] |
Payables sold by suppliers | 14
Cumulative payables sold by suppliers | $ 36

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- Definition Cumulative Payables Sold + References No definition available. + Details
Name: | duk_CumulativePayablesSold
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Payables + References No definition available. + Details
Name: | duk_PayablesLineItems
Namespace Prefix: | duk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payables Sold by Suppliers + References No definition available. + Details
Name: | duk_PayablesSoldBySuppliers
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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