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Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | $ 62 | $ 65 | $ 51
Gross decreases – tax positions in prior periods |  | (15) |
Gross increases – current period tax positions | 12 | 12 | 14
Total changes |  | (3) | 14
Unrecognized tax benefits – December 31 | 74 | 62 | 65
Amount that if recognized, would affect the effective tax rate or regulatory liability | 68 |  |
Valuation allowance | 517 | 544 |
Foreign Tax Credit |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Valuation allowance | 404 |  |
Duke Energy Carolinas |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 21 | 17 | 13
Gross increases – current period tax positions | 4 | 4 | 4
Total changes |  | 4 | 4
Unrecognized tax benefits – December 31 | 25 | 21 | 17
Amount that if recognized, would affect the effective tax rate or regulatory liability | 24 |  |
Progress Energy |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 24 | 19 | 15
Gross increases – current period tax positions | 5 | 5 | 4
Total changes |  | 5 | 4
Unrecognized tax benefits – December 31 | 29 | 24 | 19
Amount that if recognized, would affect the effective tax rate or regulatory liability | 27 |  |
Duke Energy Progress |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 18 | 13 | 10
Gross increases – current period tax positions | 4 | 5 | 3
Total changes |  | 5 | 3
Unrecognized tax benefits – December 31 | 22 | 18 | 13
Amount that if recognized, would affect the effective tax rate or regulatory liability | 20 |  |
Duke Energy Florida |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 6 | 5 | 4
Gross increases – current period tax positions | 1 | 1 | 1
Total changes |  | 1 | 1
Unrecognized tax benefits – December 31 | 7 | 6 | 5
Amount that if recognized, would affect the effective tax rate or regulatory liability | 7 |  |
Duke Energy Ohio |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 2 | 1 | 1
Gross increases – current period tax positions |  | 1 |
Total changes |  | 1 |
Unrecognized tax benefits – December 31 | 2 | 2 | 1
Amount that if recognized, would affect the effective tax rate or regulatory liability | 2 |  |
Duke Energy Indiana |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 3 | 2 | 2
Gross increases – current period tax positions |  | 1 |
Total changes |  | 1 |
Unrecognized tax benefits – December 31 | 3 | 3 | 2
Amount that if recognized, would affect the effective tax rate or regulatory liability | 3 |  |
Piedmont |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 11 | 9 | 4
Gross increases – current period tax positions | 2 | 2 | 5
Total changes |  | 2 | 5
Unrecognized tax benefits – December 31 | 13 | $ 11 | $ 9
Amount that if recognized, would affect the effective tax rate or regulatory liability | $ 11 |  |

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