XML 95 R53.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Regulatory Matters (Schedule of Net Carrying Value Of Facilities and Megawatt Capacity) (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) MW | Dec. 31, 2017 USD ($)
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | $ 89,865 | $ 86,391
Duke Energy Carolinas [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | 28,550 | 27,876
Progress Energy [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | 33,558 | 31,887
Duke Energy Florida [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | 13,561 | 12,783
Duke Energy Indiana [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Public utilities, property, plant and equipment, net | $ 10,467 | $ 10,286
Generation Facilities To Be Retired [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 1,631 |
Public utilities, property, plant and equipment, net | $ 355 |
Allen Steam Station Units 1-3 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Carolinas [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 585 |
Public utilities, property, plant and equipment, net | $ 132 |
Crystal River Units 1 and 2 [Member] | Generation Facilities To Be Retired [Member] | Progress Energy [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 766 |
Public utilities, property, plant and equipment, net | $ 100 |
Crystal River Units 1 and 2 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Florida [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 766 |
Public utilities, property, plant and equipment, net | $ 100 |
Gallagher Units 2 and 4 [Member] | Generation Facilities To Be Retired [Member] | Duke Energy Indiana [Member] |  |
Public Utilities, General Disclosures [Line Items] |  |
Capacity (in MW) | MW | 280 |
Public utilities, property, plant and equipment, net | $ 123 |

X
- Definition Coal-Fired Generation Capacity, in Megawatts + References No definition available. + Details
Name: | duk_CoalFiredGenerationCapacityPotentialPlantsToBeRetiredInMegawatts
Namespace Prefix: | duk_
Data Type: | num:powerItemType
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 Period end amount of total net PPE. + References No definition available. + Details
Name: | us-gaap_PublicUtilitiesPropertyPlantAndEquipmentNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=duk_GenerationFacilitiesToBeRetiredMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=duk_AllenSteamStationUnits13Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=duk_CrystalRiverUnits1and2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PublicUtilityAxis=duk_GallagherUnits2and4Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |