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Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | $ 24 | $ 25 | $ 17
Gross increases – tax positions in prior periods | 105 | 7 | 12
Gross decreases – tax positions in prior periods | (3) | (2) | (4)
Decreases due to settlements |  | (6) |
Total changes | 102 | (1) | 8
Unrecognized tax benefits – December 31 | 126 | 24 | 25
Amount that if recognized, would affect the effective tax rate or regulatory liability | 122 |  |
Income Tax Examination, Penalties and Interest Expense [Abstract] |  |  |
Net interest income recognized related to income taxes | 16 | 2 |
Interest receivable related to income taxes | 1 |  |
Interest payable related to income taxes | 1 | 3 | 5
Duke Energy Carolinas |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 6 | 5 | 1
Gross increases – tax positions in prior periods | 2 | 2 | 4
Gross decreases – tax positions in prior periods |  | (1) |
Total changes | 2 | 1 | 4
Unrecognized tax benefits – December 31 | 8 | 6 | 5
Amount that if recognized, would affect the effective tax rate or regulatory liability | 8 |  |
Income Tax Examination, Penalties and Interest Expense [Abstract] |  |  |
Net interest expense recognized related to income taxes |  |  | 2
Interest payable related to income taxes |  |  | 25
Progress Energy |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 9 | 5 | 2
Gross increases – tax positions in prior periods | 1 | 4 | 3
Gross decreases – tax positions in prior periods | (1) |  |
Total changes |  | 4 | 3
Unrecognized tax benefits – December 31 | 9 | 9 | 5
Amount that if recognized, would affect the effective tax rate or regulatory liability | 9 |  |
Income Tax Examination, Penalties and Interest Expense [Abstract] |  |  |
Net interest income recognized related to income taxes | 1 |  | 1
Interest payable related to income taxes |  | 1 | 1
Duke Energy Progress |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 6 | 5 | 2
Gross increases – tax positions in prior periods | 1 | 1 | 3
Gross decreases – tax positions in prior periods | (1) |  |
Total changes |  | 1 | 3
Unrecognized tax benefits – December 31 | 6 | 6 | 5
Amount that if recognized, would affect the effective tax rate or regulatory liability | 6 |  |
Income Tax Examination, Penalties and Interest Expense [Abstract] |  |  |
Net interest income recognized related to income taxes | 1 |  |
Interest payable related to income taxes |  | 1 | 1
Duke Energy Florida |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 3 | 5 | 4
Gross increases – tax positions in prior periods |  | 2 | 1
Gross decreases – tax positions in prior periods |  | (4) |
Total changes |  | (2) | 1
Unrecognized tax benefits – December 31 | 3 | 3 | 5
Amount that if recognized, would affect the effective tax rate or regulatory liability | 3 |  |
Income Tax Examination, Penalties and Interest Expense [Abstract] |  |  |
Net interest income recognized related to income taxes |  |  | 1
Duke Energy Ohio |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 1 | 1 | 4
Gross increases – tax positions in prior periods |  |  | 1
Gross decreases – tax positions in prior periods |  |  | (4)
Total changes |  |  | (3)
Unrecognized tax benefits – December 31 | 1 | 1 | 1
Amount that if recognized, would affect the effective tax rate or regulatory liability | 1 |  |
Duke Energy Indiana |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 1 | 1 |
Gross increases – tax positions in prior periods |  |  | 1
Total changes |  |  | 1
Unrecognized tax benefits – December 31 | 1 | 1 | 1
Amount that if recognized, would affect the effective tax rate or regulatory liability | 1 |  |
Piedmont |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 4 | 3 |
Gross increases – tax positions in prior periods |  | 1 | 3
Total changes |  | 1 | 3
Unrecognized tax benefits – December 31 | 4 | $ 4 | $ 3
Amount that if recognized, would affect the effective tax rate or regulatory liability | 4 |  |
Income Tax Examination, Penalties and Interest Expense [Abstract] |  |  |
Interest payable related to income taxes | $ 1 |  |

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