Asset Impairment Charge Reversal

No definition available.

Name:	duk_AssetImpairmentChargeReversal
Namespace Prefix:	duk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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:	duk_QuarterlyFinancialInformationDisclosureLineItems
Namespace Prefix:	duk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Costs incurred to effect a business combination which have been expensed during the period. Such costs could include business integration costs, systems integration and conversion costs, and severance and other employee-related costs.

+ References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationIntegrationRelatedCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230

+ Details

Name:	us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32059-109318

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

+ Details

Name:	us-gaap_IncomeTaxReconciliationChangeInEnactedTaxRate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 5.P.3)
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140864-122747

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585

+ Details

Name:	us-gaap_SeveranceCosts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount, after deduction of insurance proceeds, of loss recognized in the income statement for an event or transaction that is unusual in nature or infrequent in occurrence, or both.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233

+ Details

Name:	us-gaap_UnusualOrInfrequentItemNetOfInsuranceProceeds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of operating expense for impairments of regulated operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(b))
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

Name:	us-gaap_UtilitiesOperatingExpenseImpairments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=duk_RegulatoryImpairmentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=duk_RegulatorysettlementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=duk_ImpactsoftheTaxActMember
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:	dei_LegalEntityAxis=duk_PiedmontNaturalGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Quarterly Financial Data (Unaudited) (Unusual or Infrequently Occurring Items) (Details) - USD ($) $ in Millions	3 Months Ended						12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Line Items]
Asset Impairment Charge Reversal	$ (14)	$ 25					$ 11
Total	(14)	25	$ (225)	$ (106)	$ (199)	$ (341)	11	$ (871)
Costs to achieve mergers, integration costs			(31)	(16)	(20)	(17)		(84)
Sale of Retired Plant						107		107
Impairment charges							8	(402)	$ (282)
Severance Costs			(187)				(16)	(187)	(15)
Impairments Charges
Quarterly Financial Information Disclosure [Line Items]
Impairment charges			(60)	(93)		(55)		(208)
Regulatory settlements
Quarterly Financial Information Disclosure [Line Items]
Regulatory and Legislative Impacts					(179)	(86)		(265)
Impacts of the Tax Act
Quarterly Financial Information Disclosure [Line Items]
Tax Act			53	3		(76)		(20)
Duke Energy Carolinas
Quarterly Financial Information Disclosure [Line Items]
Total			(103)	(3)	(181)	(23)		(310)
Costs to achieve mergers, integration costs			(1)	(2)	(2)	(4)		(9)
Impairment charges							(17)	(192)	0
Severance Costs			(102)				(8)	(102)	(2)
Tax Act				(1)				(1)
Duke Energy Carolinas \| Regulatory settlements
Quarterly Financial Information Disclosure [Line Items]
Regulatory and Legislative Impacts					(179)	(19)		(198)
Progress Energy
Quarterly Financial Information Disclosure [Line Items]
Asset Impairment Charge Reversal	11	25					36
Total	11	25	(150)	(6)	(3)	(72)	36	(231)
Costs to achieve mergers, integration costs			(2)	(1)	(3)	(4)		(10)
Impairment charges							24	(87)	(156)
Severance Costs			(69)				(6)	(69)	(2)
Tax Act			(19)	(5)		(1)		(25)
Progress Energy \| Impairments Charges
Quarterly Financial Information Disclosure [Line Items]
Impairment charges			(60)					(60)
Progress Energy \| Regulatory settlements
Quarterly Financial Information Disclosure [Line Items]
Regulatory and Legislative Impacts						(67)		(67)
Duke Energy Progress
Quarterly Financial Information Disclosure [Line Items]
Total			(68)	(5)	(2)	(69)		(144)
Costs to achieve mergers, integration costs			(1)	(1)	(2)	(2)		(6)
Impairment charges							(12)	(33)	(19)
Severance Costs			(52)				(3)	(52)	(1)
Tax Act			(15)	(4)				(19)
Duke Energy Progress \| Regulatory settlements
Quarterly Financial Information Disclosure [Line Items]
Regulatory and Legislative Impacts						(67)		(67)
Duke Energy Florida
Quarterly Financial Information Disclosure [Line Items]
Total	11	25	(76)	(2)	(1)	(2)	36	(81)
Costs to achieve mergers, integration costs			(1)		(1)	(2)		(4)
Impairment charges							36	(54)	(138)
Severance Costs			(17)				(3)	(17)	(1)
Tax Act			2	(2)
Duke Energy Florida \| Impairments Charges
Quarterly Financial Information Disclosure [Line Items]
Asset Impairment Charge Reversal	$ 11	$ 25					36
Impairment charges			(60)					(60)
Duke Energy Ohio
Quarterly Financial Information Disclosure [Line Items]
Total			(14)		(5)	(110)		(129)
Costs to achieve mergers, integration costs			(6)		(5)	(3)		(14)
Sale of Retired Plant						(107)		(107)
Impairment charges									(1)
Severance Costs			(6)					(6)
Tax Act			(2)					(2)
Duke Energy Indiana
Quarterly Financial Information Disclosure [Line Items]
Total			(7)	(2)				(9)
Costs to achieve mergers, integration costs				(2)				(2)
Impairment charges								(30)	(18)
Severance Costs			(7)				(1)	(7)	(1)
Piedmont
Quarterly Financial Information Disclosure [Line Items]
Total			(24)	(11)	(9)	(6)		(50)
Costs to achieve mergers, integration costs			(22)	$ (11)	$ (9)	$ (6)		(48)
Impairment charges									(7)
Severance Costs			$ (2)				$ (1)	$ (2)	$ (9)