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Goodwill (Tables) | 9 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill By Reportable Operating Segment | The following table presents the goodwill by reportable operating segment included on Duke Energy's Condensed Consolidated Balance Sheets at September 30, 2018, and December 31, 2017.
| Electric Utilities |  |  | Gas Utilities |  |  | Commercial |  |  |
(in millions) | and Infrastructure |  |  | and Infrastructure |  |  | Renewables |  |  | Total |
Goodwill balance at December 31, 2017 | $ | 17,379 |  |  | $ | 1,924 |  |  | $ | 122 |  |  | $ | 19,425 |
Accumulated impairment charges | — |  |  | — |  |  | (29 | ) |  | $ | (29 | )
Goodwill balance at December 31, 2017, adjusted for accumulated impairment charges | $ | 17,379 |  |  | $ | 1,924 |  |  | $ | 93 |  |  | $ | 19,396 |
Goodwill balance at September 30, 2018 | $ | 17,379 |  |  | $ | 1,924 |  |  | $ | 122 |  |  | $ | 19,425 |
Accumulated impairment charges | — |  |  | — |  |  | (122 | ) |  | (122 | )
Goodwill balance at September 30, 2018, adjusted for accumulated impairment charges | $ | 17,379 |  |  | $ | 1,924 |  |  | $ | — |  |  | $ | 19,303 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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