XML 95 R55.htm IDEA: XBRL DOCUMENT
v3.20.2

Regulatory Matters (Regulatory Matters Narrative - Duke Energy Indiana) (Details) - Duke Energy Indiana - IURC - Indiana rate case 2019 - USD ($) $ in Millions | Jun. 29, 2020 | Dec. 04, 2019 | Jul. 02, 2019
--- | --- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |  |
Requested rate increase (decrease), amount |  |  | $ 395
Requested rate increase, percentage, net of tax |  | 15.60% |
Requested rate increase (decrease), amended amount |  | $ 396 |
Approved rate increase, amount | $ 146 |  |
Public utilities, approved rate increase (decrease), percentage | 5.70% |  |
Approved return on equity percentage | 9.70% |  |
Public utilities, approved equity capital structure, percentage | 53.00% |  |
Rate base | $ 10,200 |  |
Reduction of requested rate base | $ 200 |  |
Reduction due to depreciation methodology | 50.00% |  |
Reduction due to approved return on equity | 20.00% |  |
Requested return on equity, percent | 10.40% |  |
Reduction due to earnings adjustments | 20.00% |  |
Estimated step one rate | 75.00% |  |
Estimated step two rate | 25.00% |  |

X
- Definition Public Utilities, Approved Return on Equity, Step One Estimated Percentage + References No definition available. + Details
Name: | duk_PublicUtilitiesApprovedReturnonEquityStepOneEstimatedPercentage
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Approved Return on Equity, Step Two Estimated Percentage + References No definition available. + Details
Name: | duk_PublicUtilitiesApprovedReturnonEquityStepTwoEstimatedPercentage
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Public Utilities, Disclosure Of Rate Matters, Rate Base + References No definition available. + Details
Name: | duk_PublicUtilitiesDisclosureOfRateMattersRateBase
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities, Disclosure Of Rate Matters, Rate Base Reduction due to Approved Return on Equity, Percent + References No definition available. + Details
Name: | duk_PublicUtilitiesDisclosureOfRateMattersRateBaseReductionduetoApprovedReturnonEquityPercent
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Disclosure Of Rate Matters, Rate Base Reduction due to Depreciation Methodology, Percent + References No definition available. + Details
Name: | duk_PublicUtilitiesDisclosureOfRateMattersRateBaseReductionduetoDepreciationMethodologyPercent
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Disclosure Of Rate Matters, Rate Base Reduction due to Earnings Adjustments, Percent + References No definition available. + Details
Name: | duk_PublicUtilitiesDisclosureOfRateMattersRateBaseReductionduetoEarningsAdjustmentsPercent
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Public Utilities, Disclosure Of Rate Matters, Reduction of Rate Base + References No definition available. + Details
Name: | duk_PublicUtilitiesDisclosureOfRateMattersReductionofRateBase
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Public Utilities, Requested Rate Increase (Decrease), Percentage, Net Of Tax + References No definition available. + Details
Name: | duk_PublicUtilitiesRequestedRateIncreaseDecreasePercentageNetOfTax
Namespace Prefix: | duk_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's approved equity to capital, including debt and equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedEquityCapitalStructurePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's approved rate increase (decrease) by regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedRateIncreaseDecreasePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of public utility's approved return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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: | us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of public utility's amended requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmendedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of public utility's requested rate increase (decrease) with regulatory agency. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of public utility's requested return on equity. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_RegulatoryAgencyAxis=duk_IndianaUtilityRegulatoryCommissionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilitiesRegulatoryProceedingAxis=duk_IndianaRateCase2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |