Approved Appeal Bond

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Number of multi value projects approved by Midcontinent Independent System Operator, Inc.

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Coal-Fired Generation Capacity, in Megawatts

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Estimated Capital Cost Excluding AFUDC

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Estimated capital cost of new utility plant including AFUDC.

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Estimated capital cost of new project

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MISO's estimate of Duke Energy Ohio's exit obligation to MISO

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Percent of federally mandated costs to be recovered through a periodic rate adjustment

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Percent of federally mandated costs, including carrying costs, to be recovered in future rate case

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Ownership Interest in Jointly Owned Plant Transferred

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Amount of regulatory costs not yet approved by the regulatory authority.

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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.

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Face (par) amount of debt instrument at time of issuance.

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Revenue derived from the regulated (by a federal, state, or local government or agency) generation, transmission and distribution of electricity.

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Total anticipated costs associated with remediation, site restoration, postclosure, monitoring commitments, or other exit costs that may occur on the sale, disposal, or abandonment of a particular property resulting from unanticipated contamination of the assets.

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The proportionate share of interest (percent) in a jointly owned utility plant.

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The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash inflow associated with the amount received from the sale of a business segment or subsidiary or sale of an entity that is related to it but not strictly controlled during the period (for example, an unconsolidated subsidiary, affiliate, joint venture or equity method investment).

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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Percentage of public utility's approved return on equity.

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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.

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Amount of public utility's amended requested rate increase (decrease) with regulatory agency.

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Amount of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested rate increase (decrease) with regulatory agency.

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Percentage of public utility's requested return on equity.

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Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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Amount of other operating expense of regulated operation.

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Regulatory Matters (Narrative) (Details) $ in Millions			1 Months Ended		3 Months Ended			9 Months Ended		12 Months Ended
Regulatory Matters (Narrative) (Details) $ in Millions	Oct. 19, 2016 USD ($)	Oct. 03, 2016 USD ($)	Jan. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) MW	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Public Utilities, General Disclosures [Line Items]
Asset Impairment Charges					$ 10.0		$ 111.0	$ 208.0	$ 111.0
Regulatory Assets, Noncurrent				$ 11,373.0	11,896.0			11,896.0		$ 11,373.0
Electric Domestic Regulated Revenue					6,303.0		6,017.0	16,321.0	16,564.0
Payments to Acquire Businesses, Gross								10.0	1,317.0
Debt issuances					8,527.0			8,527.0
Property, Plant and Equipment, Net				75,709.0	78,216.0			$ 78,216.0		75,709.0
Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) \| MW								1,471
Property, Plant and Equipment, Net					$ 293.0			$ 293.0
Atlantic Coast Pipeline (ACP) [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					40.00%			40.00%
Atlantic Coast Pipeline (ACP) [Member] \| Dominion Resources [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					45.00%			45.00%
Atlantic Coast Pipeline (ACP) [Member] \| Piedmont Natural Gas [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					10.00%			10.00%
Sabal Trail Transmission Pipeline [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					7.50%			7.50%
Sabal Trail Transmission Pipeline [Member] \| Spectra Energy [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					59.50%			59.50%
Sabal Trail Transmission Pipeline [Member] \| NextEra [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					33.00%			33.00%
Western Carolinas Modernization Plan [Member]
Public Utilities, General Disclosures [Line Items]
Approved Appeal Bond					$ 98.0			$ 98.0
Subsequent Event [Member] \| Atlantic Coast Pipeline (ACP) [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage		47.00%
Subsequent Event [Member] \| Atlantic Coast Pipeline (ACP) [Member] \| Dominion Resources [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage		48.00%
Subsequent Event [Member] \| Atlantic Coast Pipeline (ACP) [Member] \| Piedmont Natural Gas [Member]
Public Utilities, General Disclosures [Line Items]
Ownership Interest in Jointly Owned Plant Transferred		3.00%
Proceeds from Divestiture of Interest in Joint Venture		$ 14.0
Duke Energy Carolinas [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Assets, Noncurrent				2,766.0	3,040.0			3,040.0		2,766.0
Debt issuances					1,000.0			1,000.0
Property, Plant and Equipment, Net				25,877.0	26,370.0			$ 26,370.0		25,877.0
Duke Energy Carolinas [Member] \| FERC Transmission Rates [Member]
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage amount by state commission								10.20%
Duke Energy Carolinas [Member] \| FERC Complaint [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage								8.49%
Duke Energy Carolinas [Member] \| FERC ROE Settlement [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage								10.00%
Duke Energy Carolinas [Member] \| William States Lee Combined Cycle Facility [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost of new utility plant, including AFUDC					$ 600.0			$ 600.0
Duke Energy Carolinas [Member] \| William States Lee Combined Cycle Facility [Member] \| NCEMC [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage					13.00%			13.00%
Duke Energy Carolinas [Member] \| Maximum [Member] \| Advanced Metering Infrastructure Deferral [Member] \| PSCSC [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Assets, Noncurrent					$ 45.0			$ 45.0
Progress Energy [Member]
Public Utilities, General Disclosures [Line Items]
Asset Impairment Charges					1.0		7.0	4.0	7.0
Regulatory Assets, Noncurrent				5,435.0	5,652.0			5,652.0		5,435.0
Payments to Acquire Businesses, Gross								10.0	1,249.0
Property, Plant and Equipment, Net				28,347.0	29,544.0			$ 29,544.0		28,347.0
Progress Energy [Member] \| Crystal River Units 1 and 2 [Member] \| Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) \| MW								873
Property, Plant and Equipment, Net					123.0			$ 123.0
Duke Energy Progress [Member]
Public Utilities, General Disclosures [Line Items]
Asset Impairment Charges					1.0			1.0
Regulatory Assets, Noncurrent				2,710.0	3,093.0			3,093.0		2,710.0
Payments to Acquire Businesses, Gross									1,249.0
Debt issuances					450.0			450.0
Property, Plant and Equipment, Net				17,720.0	18,055.0			$ 18,055.0		17,720.0
Duke Energy Progress [Member] \| 2016 South Carolina Rate Case [Member] \| PSCSC [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage								10.75%
Public Utilities, Requested Rate Increase (Decrease), Percentage								14.50%
Public Utilities, Requested Rate Increase (Decrease), Amount								$ 79.0
Duke Energy Progress [Member] \| Western Carolinas Modernization Plan [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost					1,100.0			$ 1,100.0
Duke Energy Progress [Member] \| FERC Transmission Rates [Member]
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage amount by state commission								10.80%
Duke Energy Progress [Member] \| FERC Complaint [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage								8.49%
Duke Energy Progress [Member] \| FERC ROE Settlement [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage								10.00%
Duke Energy Progress [Member] \| Asheville Plant [Member] \| Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) \| MW								376
Property, Plant and Equipment, Net				548.0	562.0			$ 562.0		548.0
Duke Energy Progress [Member] \| Subsequent Event [Member] \| 2016 South Carolina Rate Case Settlement [Member] \| PSCSC [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage	10.10%
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ 56.0
Duke Energy Progress [Member] \| Subsequent Event [Member] \| 2016 South Carolina Rate Case Settlement Year 1 Increase [Member] \| PSCSC [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	38.0
Duke Energy Progress [Member] \| Subsequent Event [Member] \| 2016 South Carolina Rate Case Settlement Year 2 Increase [Member] \| PSCSC [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	18.5
Duke Energy Progress [Member] \| Subsequent Event [Member] \| 2016 South Carolina Rate Case Settlement Year 2 Offset [Member] \| PSCSC [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount	$ (18.5)
Duke Energy Florida [Member]
Public Utilities, General Disclosures [Line Items]
Asset Impairment Charges					1.0		7.0	4.0	7.0
Regulatory Assets, Noncurrent				2,725.0	2,559.0			2,559.0		2,725.0
Payments to Acquire Businesses, Gross								10.0
Debt issuances					1,894.0			1,894.0
Property, Plant and Equipment, Net				10,623.0	11,485.0			11,485.0		10,623.0
Duke Energy Florida [Member] \| Hines Chiller Uprate Project [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost					150.0			150.0
Duke Energy Florida [Member] \| Hines Chiller Uprate Project Phase 1[Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount								17.0
Duke Energy Florida [Member] \| Hines Chiller Uprate Project Phase 2 [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount								3.0
Duke Energy Florida [Member] \| Osprey Energy Center Acquisition [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount								$ 48.0
Duke Energy Florida [Member] \| Osprey Energy Center Acquisition [Member] \| Scenario, Forecast [Member]
Public Utilities, General Disclosures [Line Items]
Payments to Acquire Businesses, Gross			$ 166.0
Duke Energy Florida [Member] \| Crystal River Units 1 and 2 [Member] \| Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) \| MW								873
Property, Plant and Equipment, Net					123.0			$ 123.0
Duke Energy Florida [Member] \| Crystal River Unit 3 [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Asset, Amortization Period								20 years
Duke Energy Florida [Member] \| DEFPF [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Assets, Noncurrent					1,156.0			$ 1,156.0
Debt issuances					1,294.0			1,294.0
Duke Energy Florida [Member] \| DEFPF [Member] \| Crystal River Unit 3 [Member]
Public Utilities, General Disclosures [Line Items]
Proceeds from Issuance of Debt						$ 1,287.0
Debt issuances						$ 1,294.0
Duke Energy Ohio [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Assets, Noncurrent				497.0	490.0			490.0		497.0
Electric Domestic Regulated Revenue					390.0		367.0	1,053.0	1,005.0
Debt issuances					250.0			250.0
Property, Plant and Equipment, Net				5,243.0	5,453.0			5,453.0		5,243.0
Duke Energy Ohio [Member] \| Advanced Metering Infrastructure Project [Member]
Public Utilities, General Disclosures [Line Items]
Amount of Regulatory Costs Not yet Approved					10.0			10.0
Estimated capital cost					49.0			49.0
Duke Energy Ohio [Member] \| Energy Efficiency and Peak Demand Reduction Program [Member] \| PUCO [Member]
Public Utilities, General Disclosures [Line Items]
Electric Domestic Regulated Revenue				20.0
Duke Energy Ohio [Member] \| MGP Remediation [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Assets					101.0			101.0
Duke Energy Ohio [Member] \| Accelerated Natural Gas Service Line Replacement Rider [Member] \| PUCO [Member]
Public Utilities, General Disclosures [Line Items]
Amount of Regulatory Costs Not yet Approved					240.0			240.0
Duke Energy Ohio [Member] \| Regional Transmission Organization [Member]
Public Utilities, General Disclosures [Line Items]
Exit obligation				92.0	91.0			91.0		92.0
Regulatory Assets, Noncurrent				72.0	$ 72.0			$ 72.0		72.0
Duke Energy Ohio [Member] \| RTO Realignment [Member]
Public Utilities, General Disclosures [Line Items]
Approved MVP Proposals					17			17
MISO estimate of Duke Energy Ohio's MVP obligation								$ 2,700.0
Duke Energy Ohio [Member] \| East End Site [Member] \| MGP Remediation [Member]
Public Utilities, General Disclosures [Line Items]
Environmental Exit Costs, Anticipated Cost								46.0
Duke Energy Ohio [Member] \| Minimum [Member] \| Natural Gas Pipeline Extension [Member]
Public Utilities, General Disclosures [Line Items]
Estimated Capital Cost Excluding AFUDC					$ 86.0			86.0
Duke Energy Ohio [Member] \| Maximum [Member] \| Natural Gas Pipeline Extension [Member]
Public Utilities, General Disclosures [Line Items]
Estimated Capital Cost Excluding AFUDC					110.0			110.0
Duke Energy Indiana [Member]
Public Utilities, General Disclosures [Line Items]
Asset Impairment Charges					8.0		$ 85.0	8.0	$ 85.0
Regulatory Assets, Noncurrent				716.0	909.0			909.0		716.0
Debt issuances					500.0			500.0
Property, Plant and Equipment, Net				$ 9,523.0	9,934.0			9,934.0		9,523.0
Duke Energy Indiana [Member] \| Advanced Metering Infrastructure Project [Member]
Public Utilities, General Disclosures [Line Items]
Asset Impairment Charges					8.0
Property, Plant and Equipment, Net					48.0			48.0
Duke Energy Indiana [Member] \| Coal Combustion Residual Plan [Member]
Public Utilities, General Disclosures [Line Items]
Amount of Regulatory Costs Not yet Approved					380.0			$ 380.0
Federal Mandate Costs Recovered Through Tracker Mechanism								80.00%
Federally Mandated Costs Recovered In Future Rate Case								20.00%
Duke Energy Indiana [Member] \| FERC Transmission Rates [Member]
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage amount by state commission								12.38%
Duke Energy Indiana [Member] \| FERC Transmission Rates [Member] \| Federal Energy Regulatory Commission [Member]
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage amount by state commission								0.50%
Duke Energy Indiana [Member] \| FERC Complaint 1 [Member] \| Federal Energy Regulatory Commission [Member]
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage amount by state commission								10.32%
Duke Energy Indiana [Member] \| FERC Complaint 2 [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage								8.67%
Duke Energy Indiana [Member] \| FERC Complaint 2 [Member] \| Federal Energy Regulatory Commission [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Requested Return on Equity, Percentage								9.70%
Duke Energy Indiana [Member] \| Grid Infrastructure Improvement Plan [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost					1,900.0			$ 1,900.0
Duke Energy Indiana [Member] \| Revised Grid Infrastructure Improvement Plan [Member]
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage amount by state commission								10.00%
Estimated capital cost					1,800.0			$ 1,800.0
Public Utilities, Approved Rate Increase (Decrease), Amount								1,400.0
Duke Energy Indiana [Member] \| Edwardsport Igcc Plant [Member] \| IGCC Rider Proceeding [Member] \| IURC [Member]
Public Utilities, General Disclosures [Line Items]
Legal Fees								5.5
Utilities Operating Expense, Other										$ 93.0
Public Utilities, Approved Rate Increase (Decrease), Amount								$ (87.5)
Regulatory Asset, Amortization Period								8 years
Regulatory Assets					$ 184.0			$ 184.0