v3.3.0.814

Commitments and Contingencies (Narrative) (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 02, 2014 gal T | Mar. 31, 2014 USD ($) | Sep. 30, 2015 USD ($) plant Claims project | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) plant Claims project | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($) | Aug. 18, 2014 gal
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  | $ 178,000,000 |  | $ 178,000,000 |  | $ 323,000,000 |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  |  | 1,426,000,000 | $ 1,409,000,000 | 4,274,000,000 | $ 4,254,000,000 |  |
Investments and other assets |  |  | 3,205,000,000 |  | 3,205,000,000 |  | 3,008,000,000 |
Accounts Payable, Current |  |  | 2,078,000,000 |  | 2,078,000,000 |  | 2,271,000,000 |
Charge for settlement agreement |  |  |  |  | 53,000,000 |  |  |
Progress Energy Merger Shareholder Litigation [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Litigation Settlement Amount |  |  |  |  | 146,000,000 |  |  |
Payments for Legal Settlements |  |  |  |  | 25,000,000 |  |  |
Litigation Settlement Covered by Insurance |  |  | 121,000,000 |  | $ 121,000,000 |  |  |
Brazil Expansion Lawsuit [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Obligation to expand installed generation capacity, percent |  |  |  |  | 15.00% |  |  |
Ash Basins Fines and Restitution [Member] | USDOJ [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  | $ 68,000,000 |  |  |
Ash Basins Community Service and Mitigation [Member] | USDOJ [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Litigation Settlement, Expense |  |  |  |  | 34,000,000 |  |  |
Antitrust Lawsuit [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Charge for settlement agreement |  |  |  |  | 81,000,000 |  |  |
Duke Energy Carolinas [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  | 12,000,000 |  | 12,000,000 |  | 72,000,000 |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  |  | 511,000,000 | 465,000,000 | 1,469,000,000 | 1,415,000,000 |  |
Investments and other assets |  |  | 1,018,000,000 |  | 1,018,000,000 |  | 959,000,000 |
Accounts Payable, Current |  |  | 623,000,000 |  | 623,000,000 |  | 709,000,000 |
Duke Energy Carolinas [Member] | North Carolina Ash Basins [Member] | USDOJ [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Minimum Master Credit Facility Balance Required |  |  | 250,000,000 |  | 250,000,000 |  |  |
Loss Contingency Accrual |  |  | $ 5,000,000 |  | 5,000,000 |  |  |
Duke Energy Carolinas [Member] | North Carolina Ash Basins [Member] | Dan River [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Environmental remediation expense |  |  |  |  | 24,000,000 |  |  |
Duke Energy Carolinas [Member] | North Carolina Ash Basins [Member] | Minimum [Member] | Dan River [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Coal ash released, in tons | T | 30,000 |  |  |  |  |  |  |
Basin water released, in gallons | gal | 24,000,000 |  |  |  |  |  |  |
Duke Energy Carolinas [Member] | North Carolina Ash Basins [Member] | Maximum [Member] | Dan River [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Coal ash released, in tons | T | 39,000 |  |  |  |  |  |  |
Basin water released, in gallons | gal | 27,000,000 |  |  |  |  |  |  |
Duke Energy Carolinas [Member] | New Source Review Provisions Of Clean Air Act [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Maximum civil penalties per day for each violation |  |  |  |  | $ 37,500 |  |  |
Projects with Alleged NSR Violations | project |  |  | 29 |  | 29 |  |  |
Number of Coal Plants with Alleged NSR Violations | plant |  |  | 25 |  | 25 |  |  |
Loss contingency, pending claims, number | Claims |  |  | 13 |  | 13 |  |  |
Remaining Number of Coal Plants with Alleged NSR Violations | plant |  |  | 13 |  | 13 |  |  |
Number of Retired Plants | plant |  |  | 11 |  | 11 |  |  |
Gain (Loss) Related to Litigation Settlement |  |  |  |  | $ 4,000,000 |  |  |
Litigation Settlement, Expense |  |  |  |  | 1,000,000 |  |  |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  |  | $ 2,000,000 |  | 2,000,000 |  |  |
Investments and other assets |  |  | 3,000,000 |  | 3,000,000 |  |  |
Accounts Payable, Current |  |  | 5,000,000 |  | 5,000,000 |  |  |
Duke Energy Carolinas [Member] | Asbestos Issue [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Asbestos-related injuries and damages reserves |  |  | 551,000,000 |  | 551,000,000 |  | 575,000,000 |
Reinsurance retention policy, excess retention, amount reinsured |  |  |  |  | 847,000,000 |  |  |
Probable insurance recoveries |  |  | $ 599,000,000 |  | $ 599,000,000 |  | 616,000,000 |
Duke Energy Carolinas [Member] | Asbestos Issue [Member] | Non Malignant Asbestos Claim [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Loss contingency, pending claims, number | Claims |  |  | 150 |  | 150 |  |  |
Asbestos-related injuries and damages reserves |  |  | $ 37,000,000 |  | $ 37,000,000 |  |  |
Duke Energy Carolinas [Member] | Asbestos Issue [Member] | Malignant Asbestos Claim [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Loss contingency, pending claims, number | Claims |  |  | 63 |  | 63 |  |  |
Asbestos-related injuries and damages reserves |  |  | $ 9,000,000 |  | $ 9,000,000 |  |  |
Duke Energy Carolinas [Member] | Groundwater Violation [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Charge for settlement agreement |  |  |  |  | 1,000,000 |  |  |
Progress Energy [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  | 74,000,000 |  | 74,000,000 |  | 93,000,000 |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  |  | 539,000,000 | 564,000,000 | 1,672,000,000 | 1,714,000,000 |  |
Investments and other assets |  |  | 850,000,000 |  | 850,000,000 |  | 670,000,000 |
Accounts Payable, Current |  |  | 697,000,000 |  | 697,000,000 |  | 847,000,000 |
Duke Energy Progress [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  | 17,000,000 |  | 17,000,000 |  | 37,000,000 |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  |  | 329,000,000 | 346,000,000 | 1,066,000,000 | 1,074,000,000 |  |
Investments and other assets |  |  | 484,000,000 |  | 484,000,000 |  | 412,000,000 |
Accounts Payable, Current |  |  | 381,000,000 |  | 381,000,000 |  | 481,000,000 |
Duke Energy Progress [Member] | North Carolina Ash Basins [Member] | USDOJ [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Minimum Master Credit Facility Balance Required |  |  | 250,000,000 |  | 250,000,000 |  |  |
Loss Contingency Accrual |  |  | 5,000,000 |  | 5,000,000 |  |  |
Duke Energy Progress [Member] | Groundwater Violation [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Charge for settlement agreement |  |  |  |  | 6,000,000 |  |  |
Duke Energy Progress [Member] | Groundwater Violation [Member] | L V Sutton Plant [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Civil Penalty Assessed |  |  |  |  | 25,000,000 |  |  |
Duke Energy Florida [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  | 36,000,000 |  | 36,000,000 |  | 36,000,000 |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  |  | 208,000,000 | 212,000,000 | 598,000,000 | 626,000,000 |  |
Investments and other assets |  |  | 308,000,000 |  | 308,000,000 |  | 204,000,000 |
Accounts Payable, Current |  |  | 316,000,000 |  | 316,000,000 |  | 365,000,000 |
Duke Energy Florida [Member] | Westinghouse Electric Company Litigation [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Gain contingency, unrecorded amount |  |  | 54,000,000 |  | 54,000,000 |  |  |
Loss contingency, damages sought, value |  | $ 510,000,000 |  |  |  |  |  |
Duke Energy Ohio [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Loss Contingency Accrual |  |  | 81,000,000 |  | 81,000,000 |  |  |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  |  | 124,000,000 | 134,000,000 | 370,000,000 | 378,000,000 |  |
Investments and other assets |  |  | 17,000,000 |  | 17,000,000 |  | 23,000,000 |
Accounts Payable, Current |  |  | 219,000,000 |  | 219,000,000 |  | 209,000,000 |
Charge for settlement agreement |  |  |  |  | 53,000,000 |  |  |
Duke Energy Ohio [Member] | W.C. Beckjord Station [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Gallons of Fuel Released | gal |  |  |  |  |  |  |  | 9,000
Duke Energy Ohio [Member] | Antitrust Lawsuit [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Litigation Settlement Amount |  |  |  |  | 81,000,000 |  |  |
Charge for settlement agreement |  |  |  |  | 81,000,000 |  |  |
Duke Energy Indiana [Member] |  |  |  |  |  |  |  |
Valuation and Qualifying Accounts [Abstract] |  |  |  |  |  |  |  |
Utilities Operating Expense, Maintenance, Operations, and Other Costs and Expenses |  |  | 164,000,000 | $ 160,000,000 | 525,000,000 | $ 485,000,000 |  |
Accounts Payable, Current |  |  | $ 149,000,000 |  | $ 149,000,000 |  | $ 179,000,000 |

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