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Asset Retirement Obligations Asset Retirement Obligations (Asset Retirement Costs) (Details) - USD ($) $ in Millions | Sep. 30, 2015 | Dec. 31, 2014
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Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | $ 73,776 | $ 70,046
Regulatory assets | 11,290 | 11,042
Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | 25,208 | 24,672
Regulatory assets | 2,741 | 2,465
Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | 27,538 | 25,144
Regulatory assets | 5,535 | 5,408
Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | 17,172 | 15,186
Regulatory assets | 2,816 | 2,675
Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | 5,175 | 4,937
Regulatory assets | 495 | 512
Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | 9,340 | 8,815
Regulatory assets | 645 | $ 685
Asset Retirement Obligation Costs [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | 535 |
Regulatory assets | 448 |
Asset Retirement Obligation Costs [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Regulatory assets | 178 |
Asset Retirement Obligation Costs [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Regulatory assets | 270 |
Asset Retirement Obligation Costs [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Regulatory assets | 270 |
Asset Retirement Obligation Costs [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | 116 |
Asset Retirement Obligation Costs [Member] | Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Property, Plant and Equipment, Net | $ 418 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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- Definition 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. + 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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