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Amount of accumulated unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Substantially all of the associated unrealized gains and losses on these investments are deferred as a regulatory asset or liability.

No definition available.

Name:	duk_EquitySecuritiesFVNIAccumulatedUnrealizedGain
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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

Amount of accumulated unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Substantially all of the associated unrealized gains and losses on these investments are deferred as a regulatory asset or liability.

No definition available.

Name:	duk_EquitySecuritiesFVNIAccumulatedUnrealizedLoss
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Amount of realized gain from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

No definition available.

Name:	duk_EquitySecuritiesFVNIRealizedGain
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

Amount of realized loss from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

No definition available.

Name:	duk_EquitySecuritiesFVNIRealizedLoss
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
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Equity Securities, FV-NI, Accumulated Unrealized Gain (Loss) [Abstract]

No definition available.

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Equity Securities, FV-NI, Realized Gain (Loss) [Abstract]

No definition available.

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