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Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | $ 126 | $ 24 | $ 25
Gross decreases – tax positions in prior periods | (2) | (3) | (2)
Gross increases – current period tax positions | 4 | 105 |
Gross increases – tax positions in prior periods |  |  | 7
Decreases due to settlements |  |  | (6)
Reduction due to lapse of statute of limitations | (3) |  |
Total changes | (1) | 102 | (1)
Unrecognized tax benefits – December 31 | 125 | 126 | 24
Amount that if recognized, would affect the effective tax rate or regulatory liability | 122 |  |
Duke Energy Carolinas |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 8 | 6 | 5
Gross decreases – tax positions in prior periods |  |  | (1)
Gross increases – current period tax positions | 2 | 2 |
Gross increases – tax positions in prior periods |  |  | 2
Total changes | 2 | 2 | 1
Unrecognized tax benefits – December 31 | 10 | 8 | 6
Amount that if recognized, would affect the effective tax rate or regulatory liability | 10 |  |
Progress Energy |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 9 | 9 | 5
Gross decreases – tax positions in prior periods |  | (1) |
Gross increases – current period tax positions | 1 | 1 |
Gross increases – tax positions in prior periods |  |  | 4
Total changes | 1 | 0 | 4
Unrecognized tax benefits – December 31 | 10 | 9 | 9
Amount that if recognized, would affect the effective tax rate or regulatory liability | 10 |  |
Duke Energy Progress |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 6 | 6 | 5
Gross decreases – tax positions in prior periods |  | (1) |
Gross increases – current period tax positions | 0 | 1 |
Gross increases – tax positions in prior periods |  |  | 1
Total changes |  | 0 | 1
Unrecognized tax benefits – December 31 | 6 | 6 | 6
Amount that if recognized, would affect the effective tax rate or regulatory liability | 6 |  |
Duke Energy Florida |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 3 | 3 | 5
Gross decreases – tax positions in prior periods |  |  | (4)
Gross increases – current period tax positions | 0 |  |
Gross increases – tax positions in prior periods |  |  | 2
Total changes |  | 0 | (2)
Unrecognized tax benefits – December 31 | 3 | 3 | 3
Amount that if recognized, would affect the effective tax rate or regulatory liability | 3 |  |
Duke Energy Ohio |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 1 | 1 | 1
Gross increases – current period tax positions | 0 |  |
Total changes |  |  | 0
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 | 1
Total changes |  |  | 0
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 | 4 | 3
Gross increases – tax positions in prior periods |  |  | 1
Reduction due to lapse of statute of limitations | (3) |  |
Total changes | (3) |  | 1
Unrecognized tax benefits – December 31 | 1 | $ 4 | $ 4
Amount that if recognized, would affect the effective tax rate or regulatory liability | $ 1 |  |

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