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Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | $ 242 | $ 230
Net amounts presented on Balance Sheets | 242 | 230
Other Current Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 68 | 66
Gross amounts offset | (4) | (3)
Net amounts presented on Balance Sheets | 64 | 63
Other Noncurrent Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 174 | 164
Gross amounts offset | (3) | (1)
Net amounts presented on Balance Sheets | 171 | 163
Duke Energy Carolinas [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 33 | 35
Net amounts presented on Balance Sheets | 33 | 35
Duke Energy Carolinas [Member] | Other Current Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 23 | 31
Gross amounts offset | (2) | (2)
Net amounts presented on Balance Sheets | 21 | 29
Duke Energy Carolinas [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 10 | 4
Gross amounts offset | (1) |
Net amounts presented on Balance Sheets | 9 | 4
Progress Energy [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 44 | 36
Net amounts presented on Balance Sheets | 44 | 36
Progress Energy [Member] | Other Current Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 23 | 19
Gross amounts offset | (2) | (2)
Net amounts presented on Balance Sheets | 21 | 17
Progress Energy [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 21 | 17
Gross amounts offset | (2) | (1)
Net amounts presented on Balance Sheets | 19 | 16
Duke Energy Progress [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 27 | 18
Net amounts presented on Balance Sheets | 27 | 18
Duke Energy Progress [Member] | Other Current Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 16 | 8
Gross amounts offset | (2) | (2)
Net amounts presented on Balance Sheets | 14 | 6
Duke Energy Progress [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 11 | 10
Gross amounts offset | (2) | (1)
Net amounts presented on Balance Sheets | 9 | 9
Duke Energy Florida [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 9 | 12
Net amounts presented on Balance Sheets | 9 | 12
Duke Energy Florida [Member] | Other Current Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 8 | 10
Net amounts presented on Balance Sheets | 8 | 10
Duke Energy Florida [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 1 | 2
Net amounts presented on Balance Sheets | 1 | 2
Duke Energy Ohio [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 5 | 5
Net amounts presented on Balance Sheets | 5 | 5
Duke Energy Ohio [Member] | Other Current Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 1 | 1
Net amounts presented on Balance Sheets | 1 | 1
Duke Energy Ohio [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 4 | 4
Net amounts presented on Balance Sheets | 4 | 4
Piedmont Natural Gas [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 141 | 142
Net amounts presented on Balance Sheets | 141 | 142
Piedmont Natural Gas [Member] | Other Current Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 8 | 11
Net amounts presented on Balance Sheets | 8 | 11
Piedmont Natural Gas [Member] | Other Noncurrent Liabilities [Member] |  |
Offsetting Liabilities [Line Items] |  |
Gross amounts recognized | 133 | 131
Net amounts presented on Balance Sheets | $ 133 | $ 131

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