XML 145 R103.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Subsequent Events (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Oct. 10, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Subsequent Event [Line Items] |  |  |  |  |
Operation, maintenance and other |  | $ 1,584 | $ 1,476 | $ 4,592 | $ 4,385
Hurricane Michael Storm Damage [Member] | Estimated Impact [Member] |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Operation, maintenance and other | $ 235 |  |  |  |
Estimated capital cost | $ 185 |  |  |  |

X
- Definition Estimated capital cost of new project + References No definition available. + Details
Name: | duk_Estimatedcapitalcost
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of operating expenses for the period that are associated with the utility's normal revenue producing operation; including selling, general, and administrative expenses, costs incurred for routine plant repairs and maintenance, and operations. + References No definition available. + Details
Name: | us-gaap_UtilitiesOperatingExpenseMaintenanceOperationsAndOtherCostsAndExpenses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |