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Regulatory Matters (Narrative) (Details) $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended
Regulatory Matters (Narrative) (Details) $ in Millions	Oct. 31, 2017 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) MW	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			$ 84,862.0		$ 84,862.0		$ 82,520.0
Generation Facilities To Be Retired Net			441.0		441.0		529.0
Asset Impairment Charges			207.0	$ 10.0	216.0	$ 14.0
Electric Domestic Regulated Revenue			6,091.0	6,303.0	$ 16,122.0	16,321.0
Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) \| MW					1,738
Public Utilities, Property, Plant and Equipment, Net			$ 405.0		$ 405.0
Atlantic Coast Pipeline (ACP) [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage			47.00%		47.00%
Long-term Purchase Commitment, Period					20 years
Sabal Trail Transmission Pipeline [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage			7.50%		7.50%
Estimated capital cost			$ 3,200.0		$ 3,200.0
Long-term Purchase Commitment, Period					25 years
Constitution Pipeline [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage			24.00%		24.00%
Estimated Contributions			$ 229.0		$ 229.0
Minimum [Member] \| Atlantic Coast Pipeline (ACP) [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost			5,000.0		5,000.0
Maximum [Member] \| Atlantic Coast Pipeline (ACP) [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost			$ 5,500.0		$ 5,500.0
Dominion Resources [Member] \| Atlantic Coast Pipeline (ACP) [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage			48.00%		48.00%
Southern Company Gas [Member] \| Atlantic Coast Pipeline (ACP) [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage			5.00%		5.00%
Spectra Energy Partners [Member] \| Sabal Trail Transmission Pipeline [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage			50.00%		50.00%
NextEra Energy [Member] \| Sabal Trail Transmission Pipeline [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage			42.50%		42.50%
Williams Partners L.P. [Member] \| Constitution Pipeline [Member]
Public Utilities, General Disclosures [Line Items]
Joint owner ownership percentage			41.00%		41.00%
Duke Energy Carolinas [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			$ 27,352.0		$ 27,352.0		26,762.0
Duke Energy Carolinas [Member] \| William States Lee Combined Cycle Facility [Member] \| NCEMC [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost of new utility plant, including AFUDC			$ 600.0		$ 600.0
Joint owner ownership percentage			13.00%		13.00%
Duke Energy Carolinas [Member] \| 2017 NC Rate Case [Member] \| NCUC [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount					$ 647.0
Requested Rate Increase, Percentage					13.60%
Progress Energy [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			$ 31,340.0		$ 31,340.0		30,181.0
Generation Facilities To Be Retired Net			441.0		441.0		529.0
Asset Impairment Charges			135.0	1.0	137.0	4.0
Duke Energy Progress [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			18,752.0		18,752.0		18,387.0
Generation Facilities To Be Retired Net			441.0		441.0		529.0
Asset Impairment Charges				1.0		1.0
Duke Energy Progress [Member] \| 2017 NC Rate Case [Member] \| NCUC [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount					$ 477.0
Requested Rate Increase, Percentage					14.90%
Duke Energy Progress [Member] \| Storm Cost Deferrals [Member] \| NCUC [Member]
Public Utilities, General Disclosures [Line Items]
Amount of Regulatory Costs Not yet Approved			116.0		$ 116.0
Duke Energy Progress [Member] \| Western Carolinas Modernization Plan [Member] \| Asheville Plant [Member] \| Generation Facilities To Be Retired [Member]
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) \| MW					376
Generation Facilities To Be Retired Net			405.0		$ 405.0		492.0
Duke Energy Progress [Member] \| Western Carolinas Modernization Plan [Member] \| NCUC [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost			893.0		893.0
Duke Energy Florida [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			12,586.0		12,586.0		11,790.0
Asset Impairment Charges			$ 135.0	1.0	$ 137.0	4.0
Duke Energy Florida [Member] \| Hurricane Irma Storm Damage [Member] \| FPSC [Member]
Public Utilities, General Disclosures [Line Items]
Customers Experiencing Outages			1,300,000		1,300,000
Amount of Regulatory Costs Not yet Approved			$ 500.0		$ 500.0
Duke Energy Florida [Member] \| Hurricane Irma Storm Damage [Member] \| FPSC [Member] \| Storm Costs [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Assets			400.0		400.0
Duke Energy Florida [Member] \| Hurricane Irma Storm Damage [Member] \| FPSC [Member] \| Storm Costs [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Liabilities			60.0		60.0
Amount of Regulatory Costs Not yet Approved			132.0		132.0
Duke Energy Florida [Member] \| 2017 Second Revised and Restated Settlement \| FPSC [Member]
Public Utilities, General Disclosures [Line Items]
Approved Rate Increase (Decrease), Amount					$ 67.0
Asset Impairment Charges			135.0
Approved return on equity percentage					9.50%
Duke Energy Florida [Member] \| 2017 Second Revised and Restated Settlement \| FPSC [Member] \| Under-recovered Fuel [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Assets			196.0		$ 196.0
Regulatory Asset, Amortization Period					24 months
Duke Energy Florida [Member] \| Levy Nuclear Project [Member] \| FPSC [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount					$ 82.0
Duke Energy Florida [Member] \| Hines Chiller Uprate Project [Member] \| FPSC [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost			150.0		150.0
Approved Rate Increase (Decrease), Amount					19.0
Duke Energy Ohio [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			5,851.0		5,851.0		5,547.0
Asset Impairment Charges					1.0
Electric Domestic Regulated Revenue			371.0	390.0	1,036.0	1,053.0
Duke Energy Ohio [Member] \| Regional Transmission Organization Realignment [Member]
Public Utilities, General Disclosures [Line Items]
Exit obligation			90.0		90.0		90.0
Regulatory Assets			$ 71.0		$ 71.0		71.0
Approved MVP Proposals			17		17
MISO estimate of Duke Energy Ohio's MVP obligation					$ 2,700.0
Duke Energy Ohio [Member] \| Duke Energy Kentucky Rate Case [Member] \| KPSC [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount					$ 49.0
Requested Rate Increase, Percentage					15.00%
Duke Energy Ohio [Member] \| Woodsdale Station Fuel System [Member] \| KPSC [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost			$ 55.0		$ 55.0
Duke Energy Ohio [Member] \| East Bend Coal Ash Basin Filing [Member] \| KPSC [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost			93.0		93.0
Duke Energy Ohio [Member] \| 2017 Ohio Base Rate Case [Member] \| PUCO [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount					$ 15.0
Requested Return on Equity, Percentage					10.40%
Duke Energy Ohio [Member] \| 2017 Ohio Base Rate Case [Member] \| PUCO [Member] \| Minimum [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount					$ (18.0)
Requested Return on Equity, Percentage					9.22%
Duke Energy Ohio [Member] \| 2017 Ohio Base Rate Case [Member] \| PUCO [Member] \| Maximum [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount					$ (29.0)
Requested Return on Equity, Percentage					10.24%
Duke Energy Ohio [Member] \| Natural Gas Pipeline Extension [Member] \| OPSB [Member]
Public Utilities, General Disclosures [Line Items]
Estimated Capital Cost Excluding AFUDC			110.0		$ 110.0
Duke Energy Ohio [Member] \| Advanced Metering Infrastructure Project [Member] \| KPSC [Member]
Public Utilities, General Disclosures [Line Items]
Estimated capital cost			49.0		49.0
Regulatory Assets			7.0		7.0
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] \| Energy Efficiency Cost Recovery [Member] \| PUCO [Member]
Public Utilities, General Disclosures [Line Items]
Electric Domestic Regulated Revenue		$ 20.0
Duke Energy Ohio [Member] \| Energy Efficiency Cost Recovery [Member] \| PUCO [Member] \| Maximum [Member]
Public Utilities, General Disclosures [Line Items]
Approved Rate Increase (Decrease), Amount					38.0
Duke Energy Ohio [Member] \| MGP Cost Recovery [Member] \| PUCO [Member]
Public Utilities, General Disclosures [Line Items]
Regulatory Assets			36.0		36.0
Duke Energy Indiana [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			10,124.0		10,124.0		9,924.0
Asset Impairment Charges				$ 8.0		8.0
Duke Energy Indiana [Member] \| Benton County Wind Farm Dispute [Member]
Public Utilities, General Disclosures [Line Items]
Loss contingency, damages sought, value					16.0
Litigation Settlement, Amount Awarded to Other Party					29.0
Duke Energy Indiana [Member] \| Coal Combustion Residual Plan [Member] \| IURC [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount					$ 380.0
Federal Mandate Costs Recovered Through Tracker Mechanism					80.00%
Federally Mandated Costs Recovered In Future Rate Case					20.00%
Percentage of Costs Recovered through Existing Rider					60.00%
Percentage Recovered Through Future Rate Case					40.00%
Interest Rate on Intermediary Debt for Electric Utility Plant Construction					4.73%
Duke Energy Indiana [Member] \| Coal Combustion Residual Plan [Member] \| IURC [Member] \| Maximum [Member]
Public Utilities, General Disclosures [Line Items]
Approved Rate Increase (Decrease), Amount					$ 365.0
Duke Energy Indiana [Member] \| FERC Transmission Rates [Member] \| FERC [Member]
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage					12.38%
Approved Return on Equity Percentage Adder					0.50%
Duke Energy Indiana [Member] \| FERC Complaint [Member] \| FERC [Member]
Public Utilities, General Disclosures [Line Items]
Requested Return on Equity, Percentage					8.67%
Duke Energy Indiana [Member] \| FERC Complaint 1 [Member] \| FERC [Member]
Public Utilities, General Disclosures [Line Items]
Approved return on equity percentage					10.32%
Duke Energy Indiana [Member] \| FERC Complaint 2 [Member] \| FERC [Member]
Public Utilities, General Disclosures [Line Items]
Requested Return on Equity, Percentage					9.70%
Duke Energy Indiana [Member] \| Grid Infrastructure Improvement Plan [Member] \| IURC [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			43.0		$ 43.0
Asset Impairment Charges						$ 8.0
Piedmont Natural Gas [Member]
Public Utilities, General Disclosures [Line Items]
Public Utilities, Property, Plant and Equipment, Net			$ 5,125.0		5,125.0		$ 4,814.0
Asset Impairment Charges					$ 7.0
Piedmont Natural Gas [Member] \| South Carolina RSA Filing [Member] \| PSCSC [Member]
Public Utilities, General Disclosures [Line Items]
Requested Return on Equity, Percentage					12.60%
Approved return on equity percentage					10.20%
Piedmont Natural Gas [Member] \| NCUC IMR Petition Filed October 2017 [Member] \| NCUC [Member] \| Subsequent Event [Member]
Public Utilities, General Disclosures [Line Items]
Requested Rate Increase (Decrease), Amount	$ 8.9
Piedmont Natural Gas [Member] \| NCUC IMR Petition Filed May 2017 [Member] \| NCUC [Member]
Public Utilities, General Disclosures [Line Items]
Approved Rate Increase (Decrease), Amount					$ 11.6