XML 161 R165.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Line Items] |  |  |
Refund of AMT credit carryforwards |  | $ 573 |
Reclassification of AMT credits from noncurrent deferred tax liabilities to a current federal income tax receivable |  | 286 |
Decrease in unrecognized tax benefits is reasonably possible |  | 3 |
AMT credit carryforwards |  |  |
Income Tax Disclosure [Line Items] |  |  |
Refund of AMT credit carryforwards |  | $ 573 |
Analysis of existing regulatory liability |  |  |
Income Tax Disclosure [Line Items] |  |  |
Measurement period adjustments |  |  | $ (23)
Bonus depreciation |  |  |
Income Tax Disclosure [Line Items] |  |  |
Measurement period adjustments |  |  | (10)
Nondeductible long-term incentives |  |  |
Income Tax Disclosure [Line Items] |  |  |
Measurement period adjustments |  |  | (7)
Refundable AMT credits |  |  |
Income Tax Disclosure [Line Items] |  |  |
Measurement period adjustments | $ (76) |  |
Regulatory liability |  |  |
Income Tax Disclosure [Line Items] |  |  |
Measurement period adjustments |  |  | (83)
Reclassified AMT credit carryforwards |  |  |
Income Tax Disclosure [Line Items] |  |  |
Measurement period adjustments |  |  | $ (573)

X
- 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_IncomeTaxDisclosureLineItems
Namespace Prefix: | duk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reclassification of Alternative Minimum Taxes, Noncurrent Deferred Tax Liability to Current Receivable + References No definition available. + Details
Name: | duk_ReclassificationofAlternativeMinimumTaxesNoncurrentDeferredTaxLiabilitytoCurrentReceivable
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Tax Cuts and Jobs Act, Measurement Period Adjustment, Income Tax Expense (Benefit) + References No definition available. + Details
Name: | duk_TaxCutsandJobsActMeasurementPeriodAdjustmentIncomeTaxExpenseBenefit
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of cash received during the period as refunds for the overpayment of taxes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 + Details
Name: | us-gaap_ProceedsFromIncomeTaxRefunds
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=duk_AMTCreditCarryforwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=duk_AnalysisofExistingRegulatoryLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=duk_BonusDepreciationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=duk_NondeductibleLongtermIncentivesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=duk_RefundableAMTCreditsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=duk_RegulatoryLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationAllowanceByDeferredTaxAssetAxis=duk_ReclassifiedAMTCreditCarryforwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |