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Income Taxes (Effective Tax Rates) (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Income Tax Disclosure [Line Items] |  |  |  |  |
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Provisional Income Tax Expense Benefit | $ 0 | $ 76,000,000 |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |  |  |
Effective tax rate | 16.50% |  | 32.10% | 19.90% | 32.30%
Duke Energy Carolinas [Member] |  |  |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |  |  |
Effective tax rate | 21.50% |  | 34.70% | 21.80% | 35.00%
Progress Energy [Member] |  |  |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |  |  |
Effective tax rate | 17.30% |  | 33.40% | 15.40% | 33.70%
Duke Energy Progress [Member] |  |  |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |  |  |
Effective tax rate | 20.10% |  | 31.90% | 16.80% | 33.00%
Duke Energy Florida [Member] |  |  |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |  |  |
Effective tax rate | 18.00% |  | 36.80% | 17.40% | 36.70%
Duke Energy Ohio [Member] |  |  |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |  |  |
Effective tax rate | 25.80% |  | 34.80% | 16.00% | 35.10%
Duke Energy Indiana [Member] |  |  |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |  |  |
Effective tax rate | 25.80% |  | 39.40% | 25.80% | 39.40%
Piedmont Natural Gas [Member] |  |  |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |  |  |
Effective tax rate | 27.30% |  | 38.50% | 23.90% | 37.90%

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