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Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | $ 342 | $ 242
Net amounts recognized on the Condensed Consolidated Balance Sheet | 342 | 242
Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 154 | 68
Gross amounts offset | (1) | (4)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 153 | 64
Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 188 | 174
Gross amounts offset |  | (3)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 188 | 171
Duke Energy Carolinas [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 93 | 33
Net amounts recognized on the Condensed Consolidated Balance Sheet | 93 | 33
Duke Energy Carolinas [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 85 | 23
Gross amounts offset |  | (2)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 85 | 21
Duke Energy Carolinas [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 8 | 10
Gross amounts offset |  | (1)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 8 | 9
Progress Energy [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 90 | 44
Net amounts recognized on the Condensed Consolidated Balance Sheet | 90 | 44
Progress Energy [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 55 | 23
Gross amounts offset | (1) | (2)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 54 | 21
Progress Energy [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 35 | 21
Gross amounts offset |  | (2)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 35 | 19
Duke Energy Progress [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 35 | 27
Net amounts recognized on the Condensed Consolidated Balance Sheet | 35 | 27
Duke Energy Progress [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 26 | 16
Gross amounts offset | (1) | (2)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 25 | 14
Duke Energy Progress [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 9 | 11
Gross amounts offset |  | (2)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 9 | 9
Duke Energy Florida [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 39 | 9
Net amounts recognized on the Condensed Consolidated Balance Sheet | 39 | 9
Duke Energy Florida [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 29 | 8
Net amounts recognized on the Condensed Consolidated Balance Sheet | 29 | 8
Duke Energy Florida [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 10 | 1
Net amounts recognized on the Condensed Consolidated Balance Sheet | 10 | 1
Duke Energy Ohio [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 6 | 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 | 5 | 4
Net amounts recognized on the Condensed Consolidated Balance Sheet | 5 | 4
Duke Energy Indiana [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 2 |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 2 |
Duke Energy Indiana [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 2 |
Net amounts recognized on the Condensed Consolidated Balance Sheet | 2 |
Piedmont Natural Gas [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 114 | 141
Net amounts recognized on the Condensed Consolidated Balance Sheet | 114 | 141
Piedmont Natural Gas [Member] | Other Current Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 7 | 8
Net amounts recognized on the Condensed Consolidated Balance Sheet | 7 | 8
Piedmont Natural Gas [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 107 | 133
Net amounts recognized on the Condensed Consolidated Balance Sheet | $ 107 | $ 133

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