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Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Offsetting Assets [Line Items] |  |
Gross amounts recognized | $ 57 | $ 51
Net amounts presented on Balance Sheets | 57 | 51
Current Assets, Other [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 38 | 35
Gross amounts offset | (3) |
Net amounts presented on Balance Sheets | 35 | 35
Other Noncurrent Assets [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 19 | 16
Gross amounts offset | (3) |
Net amounts presented on Balance Sheets | 16 | 16
Duke Energy Carolinas [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 3 | 2
Net amounts presented on Balance Sheets | 3 | 2
Duke Energy Carolinas [Member] | Current Assets, Other [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 2 | 2
Gross amounts offset | (2) |
Net amounts presented on Balance Sheets |  | 2
Duke Energy Carolinas [Member] | Other Noncurrent Assets [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 1 |
Gross amounts offset | (1) |
Progress Energy [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 4 | 3
Net amounts presented on Balance Sheets | 4 | 3
Progress Energy [Member] | Current Assets, Other [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 2 | 2
Gross amounts offset | (2) |
Net amounts presented on Balance Sheets |  | 2
Progress Energy [Member] | Other Noncurrent Assets [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 2 | 1
Gross amounts offset | (2) |
Net amounts presented on Balance Sheets |  | 1
Duke Energy Progress [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 4 | 2
Net amounts presented on Balance Sheets | 4 | 2
Duke Energy Progress [Member] | Current Assets, Other [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 2 | 1
Gross amounts offset | (2) |
Net amounts presented on Balance Sheets |  | 1
Duke Energy Progress [Member] | Other Noncurrent Assets [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 2 | 1
Gross amounts offset | (2) |
Net amounts presented on Balance Sheets |  | 1
Duke Energy Florida [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 1
Net amounts presented on Balance Sheets |  | 1
Duke Energy Florida [Member] | Current Assets, Other [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized |  | 1
Net amounts presented on Balance Sheets |  | 1
Duke Energy Ohio [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 6 | 1
Net amounts presented on Balance Sheets | 6 | 1
Duke Energy Ohio [Member] | Current Assets, Other [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 6 | 1
Net amounts presented on Balance Sheets | 6 | 1
Duke Energy Indiana [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 23 | 27
Net amounts presented on Balance Sheets | 23 | 27
Duke Energy Indiana [Member] | Current Assets, Other [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 23 | 27
Net amounts presented on Balance Sheets | 23 | 27
Piedmont Natural Gas [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 3 | 2
Net amounts presented on Balance Sheets | 3 | 2
Piedmont Natural Gas [Member] | Current Assets, Other [Member] |  |
Offsetting Assets [Line Items] |  |
Gross amounts recognized | 3 | 2
Net amounts presented on Balance Sheets | $ 3 | $ 2

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