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Commitments and Contingencies (Narrative) (Details) $ in Millions |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 18, 2018 USD ($) | Jun. 30, 2019 USD ($) plant claim | Dec. 31, 2018 USD ($) | Dec. 31, 2016 plant
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Loss contingency accrual |  | $ 64 | $ 65 |
Coal Ash Insurance Coverage Litigation [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Number of NC and SC plants with ash basins | plant |  | 15 |  |
NCDEQ State Enforcement Actions [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Number of plants with no disputed facts | plant |  |  |  | 7
Number of NC plants with ash basins | plant |  |  |  | 14
Number of plants with disputed facts | plant |  |  |  | 7
Duke Energy Carolinas [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Loss contingency accrual |  | $ 7 | 9 |
Duke Energy Carolinas [Member] | Asbestos-related Injuries and Damages Claims [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Asbestos-related injuries and damages reserves |  | 607 | 630 |
Reinsurance retention policy, excess retention, amount reinsured |  | 764 |  |
Probable insurance recoveries |  | $ 739 | 739 |
Duke Energy Carolinas [Member] | Asbestos-related Injuries and Damages Claims [Member] | Non-Malignant Asbestos Claim [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Loss contingency, pending claims, number | claim |  | 145 |  |
Asbestos-related injuries and damages reserves |  | $ 38 |  |
Duke Energy Carolinas [Member] | Asbestos-related Injuries and Damages Claims [Member] | Malignant Asbestos Claim [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Loss contingency, pending claims, number | claim |  | 50 |  |
Asbestos-related injuries and damages reserves |  | $ 16 |  |
Progress Energy [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Loss contingency accrual |  | 55 | 54 |
Duke Energy Progress [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Loss contingency accrual |  | 14 | 12 |
Duke Energy Progress [Member] | Spent Nuclear Fuel Matters [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Pending litigation, damages sought | $ 100 |  |  |
Duke Energy Florida [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Loss contingency accrual |  | 24 | $ 24 |
Duke Energy Florida [Member] | Spent Nuclear Fuel Matters [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Pending litigation, damages sought | $ 203 |  |  |
Duke Energy Florida [Member] | Fluor Contract Litigation [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Pending litigation, damages sought |  | 110 |  |
Fluor Letter Of Credit [Member] | Duke Energy Florida [Member] |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |
Drawings on credit facility |  | $ 67 |  |

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