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Fair Value Measurements (Other Fair Value Disclosure) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, book value | $ 60,718 | $ 58,126
Long-term debt, fair value | 69,503 | 63,062
Piedmont Natural Gas and Progress Energy |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Unamortized debt discount (premium), net | 1,400 | 1,500
Duke Energy Carolinas |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, book value | 12,548 | 11,900
Long-term debt, fair value | 15,165 | 13,516
Progress Energy |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, book value | 19,865 | 19,634
Long-term debt, fair value | 23,825 | 22,291
Duke Energy Progress |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, book value | 9,358 | 9,058
Long-term debt, fair value | 10,808 | 9,934
Duke Energy Florida |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, book value | 7,917 | 7,987
Long-term debt, fair value | 9,684 | 9,131
Duke Energy Ohio |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, book value | 3,089 | 2,619
Long-term debt, fair value | 3,619 | 2,964
Duke Energy Indiana |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, book value | 4,104 | 4,057
Long-term debt, fair value | 5,140 | 4,800
Piedmont Natural Gas |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long-term debt, book value | 2,780 | 2,384
Long-term debt, fair value | $ 3,276 | $ 2,642

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