Acceleration of cash receovery through the fuel clause permitted by FPSC.

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Amount of any reduction to the carrying amounts of regulated liabilities that result from rate actions of a regulator. This adjustment is recorded as a reduction to expense.

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The limitation of project cost and/or recovery that can be passed on to customers.

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Estimated capital cost to Duke Energy.

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Estimated capital cost of new utility plant including AFUDC.

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

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Gallons of Fuel Released

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The amount of unrecovered investment for a proposed nuclear station.

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Percent of AFUDC allowed by IURC for recovery for Edwardsport IGCC after June 30, 2012.

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- Definition

The date that new rates go into effect after approval of the rate case.

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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-Topic 360

-SubTopic 10

-Section 45

-Paragraph 4

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Amount of a decommissioning liability associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service. This may include operating assets such as nuclear power plants or shipping vessels.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 5.Y.Q2)

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

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-Name Accounting Standards Codification

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-SubTopic 360

-Section S99

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-Subparagraph (SAB TOPIC 10.C)

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 10

-Section C

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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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-Subparagraph (SX 210.5-02.13)

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-Name Regulation S-X (SX)

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-Section 02

-Paragraph 13

-Subparagraph a

-Article 5

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-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 8

-Article 7

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- Definition

Amount capitalized of allowance for funds used during construction.

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-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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-Topic 980

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-Section 45

-Paragraph 1

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- Definition

Percentage of public utility's approved equity to capital, including debt and equity.

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No definition available.

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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 rate increase (decrease) by regulatory agency.

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Percentage of public utility's approved return on equity.

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost.

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-SubTopic 340

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-Paragraph 1

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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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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-SubTopic 10

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-Paragraph 2

-Subparagraph (SAB TOPIC 5.P.4(b))

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-Name Staff Accounting Bulletin (SAB)

-Number Topic 5

-Section P

-Subsection 3, 4

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Regulatory Matters (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended					3 Months Ended	9 Months Ended		0 Months Ended					3 Months Ended		9 Months Ended			0 Months Ended			3 Months Ended			3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended					3 Months Ended	9 Months Ended		3 Months Ended				3 Months Ended		9 Months Ended			0 Months Ended		12 Months Ended								9 Months Ended			9 Months Ended
Regulatory Matters (Narrative) (Details) (USD $)	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Sep. 30, 2014 Atlantic Coast Pipeline [Member]	Sep. 30, 2014 Atlantic Coast Pipeline [Member] Dominion Resources [Member]	Sep. 30, 2014 Duke Energy Carolinas [Member]	Sep. 30, 2014 Duke Energy Carolinas [Member]	Dec. 31, 2013 Duke Energy Carolinas [Member]	Sep. 24, 2013 Duke Energy Carolinas [Member] Rate Case [Member] NCUC [Member]	Sep. 24, 2013 Duke Energy Carolinas [Member] Rate Case Step One [Member] NCUC [Member]	Sep. 24, 2013 Duke Energy Carolinas [Member] Rate Case Step Two [Member] NCUC [Member]	Sep. 30, 2014 Duke Energy Carolinas [Member] William State Lee III Nuclear Station [Member]	Sep. 30, 2014 Duke Energy Carolinas [Member] William State Lee III Nuclear Station [Member] NCEMC [Member]	Sep. 30, 2014 Duke Energy Progress [Member]	Sep. 30, 2013 Duke Energy Progress [Member]	Sep. 30, 2014 Duke Energy Progress [Member]	Sep. 30, 2013 Duke Energy Progress [Member]	Dec. 31, 2013 Duke Energy Progress [Member]	May 30, 2013 Duke Energy Progress [Member] Rate Case [Member] NCUC [Member]	May 30, 2013 Duke Energy Progress [Member] Rate Case Step One [Member] NCUC [Member]	May 30, 2013 Duke Energy Progress [Member] Rate Case Step Two [Member] NCUC [Member]	Sep. 30, 2014 Duke Energy Progress [Member] FERC Mitigation [Member]	Sep. 30, 2013 Duke Energy Progress [Member] Shearon Harris Nuclear Station [Member]	Sep. 30, 2014 Duke Energy Progress [Member] Shearon Harris Nuclear Station [Member]	Sep. 30, 2014 Duke Energy Florida [Member]	Sep. 30, 2013 Duke Energy Florida [Member]	Sep. 30, 2014 Duke Energy Florida [Member]	Sep. 30, 2013 Duke Energy Florida [Member]	Dec. 31, 2013 Duke Energy Florida [Member]	Sep. 30, 2013 Duke Energy Florida [Member] Removal Costs [Member]	Sep. 30, 2013 Duke Energy Florida [Member] Removal Costs [Member]	Sep. 30, 2014 Duke Energy Florida [Member] 2013 FPSC Settlement Agreement [Member] New Generation Needs [Member]	Sep. 30, 2014 Duke Energy Florida [Member] Crystal River Unit 3 [Member]	Sep. 30, 2014 Duke Energy Florida [Member] Crystal River Unit 3 [Member] Amount Subject To Cost Cap [Member]	Sep. 30, 2014 Duke Energy Florida [Member] Crystal River Unit 3 [Member] Uprate and ISFSI Projects [Member]	Sep. 30, 2013 Duke Energy Florida [Member] Crystal River Unit 3 [Member] 2013 FPSC Settlement Agreement [Member]	Sep. 30, 2014 Duke Energy Florida [Member] Crystal River Unit 3 [Member] 2013 FPSC Settlement Agreement [Member]	Sep. 30, 2014 Duke Energy Florida [Member] Levy Nuclear Station [Member]	Sep. 30, 2013 Duke Energy Florida [Member] Levy Nuclear Station [Member] 2013 FPSC Settlement Agreement [Member]	Sep. 30, 2014 Duke Energy Florida [Member] Citrus County Station [Member]	Sep. 30, 2014 Duke Energy Florida [Member] Suwannee Station [Member]	Sep. 30, 2014 Duke Energy Florida [Member] Hines Energy Complex [Member]	Sep. 30, 2014 Duke Energy Ohio [Member]	Sep. 30, 2013 Duke Energy Ohio [Member]	Sep. 30, 2014 Duke Energy Ohio [Member]	Sep. 30, 2013 Duke Energy Ohio [Member]	Dec. 31, 2013 Duke Energy Ohio [Member]	Nov. 13, 2013 Duke Energy Ohio [Member] MGP Remediation [Member] PUCO [Member]	Nov. 13, 2013 Duke Energy Ohio [Member] Natural Gas Rate Case [Member] PUCO [Member]	Dec. 31, 2012 Duke Energy Ohio [Member] RTO Realignment [Member]	Sep. 30, 2014 Duke Energy Ohio [Member] RTO Realignment [Member]	Dec. 31, 2013 Duke Energy Ohio [Member] RTO Realignment [Member]	Sep. 30, 2014 Duke Energy Ohio [Member] Regional Transmission Organization [Member]	Aug. 18, 2014 Duke Energy Ohio [Member] W.C. Beckjord Station [Member] gal	Sep. 30, 2014 Duke Energy Indiana [Member]	Dec. 31, 2013 Duke Energy Indiana [Member]	Sep. 30, 2014 Duke Energy Indiana [Member] Grid Infrastructure Improvement Plan [Member]	Sep. 30, 2014 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member]	Sep. 30, 2014 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member] Edwardsport Event November 20, 2007 [Member]	Sep. 30, 2014 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member] Edwardsport Event December 27, 2012 [Member]	Sep. 30, 2014 Duke Energy Indiana [Member] Edwardsport IGCC Plant [Member] Edwardsport Event September 8, 2014 [Member]
Public Utilities, General Disclosures [Line Items]
Approved rate increase amount by state commission												$ 204,000,000	$ 30,000,000									$ 147,000,000	$ 31,000,000																											$ 56,000,000
Approved percentage rate increase by state commission												4.50%	0.60%									4.50%	1.00%
Approved return on equity percentage amount by state commission											10.20%										10.20%													10.50%					7.35%												9.84%
Rate increase begin date											Sep. 25, 2013										Jun. 01, 2013
Approved equity capital structure, percentage											53.00%										53.00%
Joint owner ownership percentage						40.00%	45.00%								13.00%
Impairment charges	1,000,000	2,000,000	81,000,000	388,000,000					3,000,000									(18,000,000)	22,000,000					(18,000,000)	22,000,000		1,000,000	1,000,000	2,000,000	346,000,000								295,000,000			65,000,000						94,000,000
Regulatory assets, noncurrent	10,252,000,000		10,252,000,000		9,191,000,000			1,986,000,000	1,986,000,000	1,527,000,000						2,187,000,000		2,187,000,000		1,384,000,000						48,000,000	2,631,000,000		2,631,000,000		2,729,000,000					1,373,000,000	268,000,000			54,000,000					480,000,000		480,000,000		471,000,000						74,000,000		670,000,000	717,000,000
Regulatory assets, current	1,232,000,000		1,232,000,000		895,000,000			388,000,000	388,000,000	295,000,000						325,000,000		325,000,000		127,000,000							241,000,000		241,000,000		221,000,000									33,000,000					67,000,000		67,000,000		57,000,000								134,000,000	118,000,000
Amount of reduction to carrying amount of regulatory liabilities																																22,000,000	95,000,000
Gallons of Fuel Released																																																								9,000
Decommissioning cost study estimate																																			1,180,000,000
Acceleration of cash recovery through fuel clause																																							130,000,000
Cost Cap for customers																																							1,466,000,000																							2,595,000,000
Percent of AFUDC Allowed																																																												85.00%
Net unrecovered investment																																								207,000,000
Restructuring Reserve																																								25,000,000													95,000,000	95,000,000
Net property, plant and equipment	69,595,000,000		69,595,000,000		69,490,000,000			25,126,000,000	25,126,000,000	23,012,000,000						14,580,000,000		14,580,000,000		13,650,000,000							9,815,000,000		9,815,000,000		9,611,000,000									120,000,000					4,905,000,000		4,905,000,000		8,235,000,000								8,780,000,000	8,576,000,000
MISO estimate of Duke Energy Ohio's MVP obligation																																																				2,700,000,000
Estimated capital cost of new utility plant, including AFUDC														600,000,000																												1,500,000,000	197,000,000	160,000,000																	1,985,000,000
Allowance for Funds Used During Construction, Capitalized Interest																																																															61,000,000
Estimated capital cost																																																											$ 1,900,000,000