v2.4.0.8

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
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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 |  |  |  |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
Name: | us-gaap_RestructuringReserve
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant