Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

+ Details

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountEnergyMeasure
Namespace Prefix:	us-gaap_
Data Type:	num:energyItemType
Balance Type:	na
Period Type:	duration

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeNonmonetaryNotionalAmountVolume
Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
Period Type:	duration

- Definition

Variable interest rate in effect as of the balance sheet date related to the interest rate derivative.

+ References

No definition available.

+ Details

Name:	us-gaap_DerivativeVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_PriceRiskDerivativeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilityAxis=us-gaap_ElectricTransmissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PublicUtilityAxis=us-gaap_GasDistributionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyCarolinasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_ProgressEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyProgressMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyIndianaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityPrimaryBeneficiaryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

Derivatives and Hedging (Notional Amounts of Derivative Instruments) (Details) Bcf in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) GWh Bcf	Dec. 31, 2014 USD ($) GWh Bcf	Oct. 31, 2015 USD ($)
Commodity Contracts [Member] \| Electricity [Member]
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours \| GWh	76	25,370
Commodity Contracts [Member] \| Natural Gas [Member]
Derivative [Line Items]
Notional amount, volume, in millions of decatherms \| Bcf	389	676
Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 1,241	$ 1,027
Duke Energy Carolinas [Member] \| Commodity Contracts [Member] \| Natural Gas [Member]
Derivative [Line Items]
Notional amount, volume, in millions of decatherms \| Bcf	61	35
Progress Energy [Member] \| Commodity Contracts [Member] \| Natural Gas [Member]
Derivative [Line Items]
Notional amount, volume, in millions of decatherms \| Bcf	328	328
Progress Energy [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 500	$ 250
Duke Energy Progress [Member] \| Commodity Contracts [Member] \| Natural Gas [Member]
Derivative [Line Items]
Notional amount, volume, in millions of decatherms \| Bcf	110	116
Duke Energy Progress [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 250
Duke Energy Florida [Member] \| Commodity Contracts [Member] \| Natural Gas [Member]
Derivative [Line Items]
Notional amount, volume, in millions of decatherms \| Bcf	218	212
Duke Energy Florida [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 250	$ 250
Duke Energy Ohio [Member] \| Commodity Contracts [Member] \| Electricity [Member]
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours \| GWh	3	19,141
Duke Energy Ohio [Member] \| Commodity Contracts [Member] \| Natural Gas [Member]
Derivative [Line Items]
Notional amount, volume, in millions of decatherms \| Bcf		313
Duke Energy Ohio [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 27	$ 27
Duke Energy Indiana [Member] \| Commodity Contracts [Member] \| Electricity [Member]
Derivative [Line Items]
Notional amount, energy measure, in gigawatt-hours \| GWh	39
Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 714	750
Not Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	527	277
Not Designated as Hedging Instrument [Member] \| Progress Energy [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	500	250
Not Designated as Hedging Instrument [Member] \| Duke Energy Progress [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 250
Floating interest rate	1.75%
Not Designated as Hedging Instrument [Member] \| Duke Energy Florida [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 250	250
Not Designated as Hedging Instrument [Member] \| Duke Energy Ohio [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	27	27
Variable Interest Entity, Primary Beneficiary [Member] \| Designated as Hedging Instrument [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount	$ 509	$ 541
Subsequent Event [Member] \| Duke Energy Carolinas [Member] \| Interest Rate Contracts [Member]
Derivative [Line Items]
Notional amount			$ 400