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Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | $ 38 | $ 57
Net amounts recognized on the Condensed Consolidated Balance Sheet | 38 | 57
Current Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 37 | 38
Gross amounts offset |  | (3)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 37 | 35
Noncurrent Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 1 | 19
Gross amounts offset |  | (3)
Net amounts recognized on the Condensed Consolidated Balance Sheet | 1 | 16
Duke Energy Carolinas [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 3
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 3
Duke Energy Carolinas [Member] | Current Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Duke Energy Carolinas [Member] | Noncurrent Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 1
Gross amounts offset |  | (1)
Progress Energy [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 4
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 4
Progress Energy [Member] | Current Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Progress Energy [Member] | Noncurrent Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Duke Energy Progress [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 4
Net amounts recognized on the Condensed Consolidated Balance Sheet |  | 4
Duke Energy Progress [Member] | Current Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Duke Energy Progress [Member] | Noncurrent Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized |  | 2
Gross amounts offset |  | (2)
Duke Energy Ohio [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 7 | 6
Duke Energy Ohio [Member] | Current Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 7 | 6
Net amounts recognized on the Condensed Consolidated Balance Sheet | 7 | 6
Duke Energy Indiana [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 29 | 23
Net amounts recognized on the Condensed Consolidated Balance Sheet | 29 | 23
Duke Energy Indiana [Member] | Current Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 29 | 23
Net amounts recognized on the Condensed Consolidated Balance Sheet | 29 | 23
Piedmont Natural Gas [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 2 | 3
Net amounts recognized on the Condensed Consolidated Balance Sheet | 2 | 3
Piedmont Natural Gas [Member] | Current Assets, Other [Member] |  |
Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | 2 | 3
Net amounts recognized on the Condensed Consolidated Balance Sheet | $ 2 | $ 3

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