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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2015
Goodwill [Line Items] |
Goodwill By Reportable Operating Segment | The following table presents goodwill by reportable operating segment for Duke Energy. Duke Energy
| Regulated |  |  | International |  |  | Commercial |  |  |
(in millions) | Utilities |  |  | Energy |  |  | Portfolio |  |  | Total |
Goodwill at December 31, 2014 (a) | 15,950 |  |  | 307 |  |  | 64 |  |  | 16,321 |
Foreign exchange and other changes | — |  |  | (33 | ) |  | — |  |  | (33 | )
Acquisitions | — |  |  | — |  |  | 24 |  |  | 24 |
Goodwill at September 30, 2015 | $ | 15,950 |  |  | $ | 274 |  |  | $ | 88 |  |  | $ | 16,312 |
(a) | Excludes fully impaired Goodwill related to the nonregulated Midwest generation business which was sold in the second quarter of 2015. See Note 2 for further information related to the sale.

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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