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Commitments and Contingencies (Narrative) (Details) | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) plant claim T | Dec. 31, 2017 USD ($)
Valuation and Qualifying Accounts [Abstract] |  |  |
Loss Contingency Accrual |  | $ 68,000,000 | $ 88,000,000
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 |
Groundwater Contamination Claims [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Goodwill Payment |  | $ 5,000 |
Water Bill Stipend Period |  | 25 years |
Duke Energy Carolinas [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Loss Contingency Accrual |  | $ 15,000,000 | 30,000,000
Duke Energy Carolinas [Member] | Groundwater Contamination Claims [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Loss Contingency Accrual |  | 10,000,000 |
Duke Energy Carolinas [Member] | Asbestos-related Injuries and Damages Claims [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Asbestos-related injuries and damages reserves |  | 466,000,000 | 489,000,000
Reinsurance retention policy, excess retention, amount reinsured |  | 797,000,000 |
Probable insurance recoveries |  | $ 585,000,000 | 585,000,000
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 |  | 120 |
Asbestos-related injuries and damages reserves |  | $ 29,000,000 |
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 |  | 47 |
Asbestos-related injuries and damages reserves |  | $ 12,000,000 |
Progress Energy [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Loss Contingency Accrual |  | 52,000,000 | 55,000,000
Duke Energy Progress [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Loss Contingency Accrual |  | 11,000,000 | 13,000,000
Duke Energy Progress [Member] | Groundwater Contamination Claims [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Loss Contingency Accrual |  | 3,000,000 |
Duke Energy Progress [Member] | Spent Nuclear Fuels [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Gain Contingency, Unrecorded Amount |  |  | 48,000,000
Litigation Settlement, Amount Awarded from Other Party |  | $ 48,000,000 |
Duke Energy Progress [Member] | Gypsum Supply Agreements [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Minimum Amount of Gypsum To Be Supplied | T |  | 50,000 |
Duke Energy Florida [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Loss Contingency Accrual |  | $ 25,000,000 | 24,000,000
Duke Energy Florida [Member] | Spent Nuclear Fuels [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Gain Contingency, Unrecorded Amount |  |  | $ 25,000,000
Litigation Settlement, Amount Awarded from Other Party |  | 21,000,000 |
Duke Energy Florida [Member] | Westinghouse Electric Company Litigation [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Gain Contingency, Unrecorded Amount |  | 54,000,000 |
Loss Contingency, Damages Sought, Original Amount |  | 510,000,000 |
Loss Contingency, Damages Awarded, Value |  | 30,000,000 |
Gain Contingency, Dismissed Amount |  | 54,000,000 |
Loss Contingency Damages Awarded and Interest, Value |  | 34,000,000 |
Duke Energy Florida [Member] | MGP Cost Recovery Action [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Gain Contingency, Unrecorded Amount |  | $ 43,000,000 |
Subsequent Event [Member] | Duke Energy Florida [Member] | Westinghouse Electric Company Litigation [Member] |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |
Loss Contingency, Damages Paid, Value | $ 34,000,000 |  |

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