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Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | $ 225 | $ 230
Net amounts recognized on the Condensed Consolidated Balance Sheet | 225 | 230
Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 35 | 66
Gross amounts offset | (4) | (3)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 31 | 63
Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 190 | 164
Gross amounts offset | (1) | (1)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 189 | 163
Duke Energy Carolinas [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 28 | 35
Net amounts recognized on the Condensed Consolidated Balance Sheet | 28 | 35
Duke Energy Carolinas [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 14 | 31
Gross amounts offset | (2) | (2)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 12 | 29
Duke Energy Carolinas [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 14 | 4
Net amounts recognized on the Condensed Consolidated Balance Sheet | 14 | 4
Progress Energy [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 37 | 36
Net amounts recognized on the Condensed Consolidated Balance Sheet | 37 | 36
Progress Energy [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 11 | 19
Gross amounts offset | (2) | (2)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 9 | 17
Progress Energy [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 26 | 17
Gross amounts offset | (1) | (1)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 25 | 16
Duke Energy Progress [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 24 | 18
Net amounts recognized on the Condensed Consolidated Balance Sheet | 24 | 18
Duke Energy Progress [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 8 | 8
Gross amounts offset | (2) | (2)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 6 | 6
Duke Energy Progress [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 16 | 10
Gross amounts offset | (1) | (1)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 15 | 9
Duke Energy Florida [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 5 | 12
Net amounts recognized on the Condensed Consolidated Balance Sheet | 5 | 12
Duke Energy Florida [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 3 | 10
Net amounts recognized on the Condensed Consolidated Balance Sheet | 3 | 10
Duke Energy Florida [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 2 | 2
Net amounts recognized on the Condensed Consolidated Balance Sheet | 2 | 2
Duke Energy Ohio [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 4 | 5
Net amounts recognized on the Condensed Consolidated Balance Sheet | 4 | 5
Duke Energy Ohio [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 1 | 1
Net amounts recognized on the Condensed Consolidated Balance Sheet | 1 | 1
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 3 | 4
Net amounts recognized on the Condensed Consolidated Balance Sheet | 3 | 4
Piedmont Natural Gas [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 153 | 142
Net amounts recognized on the Condensed Consolidated Balance Sheet | 153 | 142
Piedmont Natural Gas [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 7 | 11
Net amounts recognized on the Condensed Consolidated Balance Sheet | 7 | 11
Piedmont Natural Gas [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 146 | 131
Net amounts recognized on the Condensed Consolidated Balance Sheet | $ 146 | $ 131

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