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Goodwill (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Goodwill [Line Items] |  |
Goodwill balance | $ 19,425,000,000 | $ 19,425,000,000
Accumulated impairment charges | (29,000,000) | (29,000,000)
Goodwill, adjusted for accumulated impairment charges | 19,396,000,000 | 19,396,000,000
Electric Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 17,379,000,000 | 17,379,000,000
Goodwill, adjusted for accumulated impairment charges | 17,379,000,000 | 17,379,000,000
Gas Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 1,924,000,000 | 1,924,000,000
Goodwill, adjusted for accumulated impairment charges | 1,924,000,000 | 1,924,000,000
Commercial Renewables [Member] |  |
Goodwill [Line Items] |  |
Goodwill balance | 122,000,000 | 122,000,000
Accumulated impairment charges | (29,000,000) | (29,000,000)
Goodwill, adjusted for accumulated impairment charges | 93,000,000 | 93,000,000
Duke Energy Ohio [Member] |  |
Goodwill [Line Items] |  |
Accumulated impairment charges | (216,000,000) | (216,000,000)
Goodwill, adjusted for accumulated impairment charges | 920,000,000 | 920,000,000
Duke Energy Ohio [Member] | Electric Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill, adjusted for accumulated impairment charges | 596,000,000 | 596,000,000
Duke Energy Ohio [Member] | Gas Utilities and Infrastructure [Member] |  |
Goodwill [Line Items] |  |
Goodwill, adjusted for accumulated impairment charges | 324,000,000 | 324,000,000
Progress Energy [Member] |  |
Goodwill [Line Items] |  |
Accumulated impairment charges | 0 | 0
Goodwill, adjusted for accumulated impairment charges | 3,655,000,000 | 3,655,000,000
Piedmont Natural Gas [Member] |  |
Goodwill [Line Items] |  |
Accumulated impairment charges | 0 | 0
Goodwill, adjusted for accumulated impairment charges | $ 49,000,000 | $ 49,000,000

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