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Income Taxes (Other Disclosures) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | $ 74 | $ 62 | $ 65
Gross decreases – tax positions in prior periods | (2) |  | (15)
Gross increases – current period tax positions |  | 12 | 12
Total changes |  |  | (3)
Unrecognized tax benefits – December 31 | 72 | 74 | 62
Amount that if recognized, would affect the effective tax rate or regulatory liability | 67 |  |
Valuation allowance | 130 | 517 |
Foreign Tax Credit |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Valuation allowance | 36 |  |
Duke Energy Carolinas |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 25 | 21 | 17
Gross increases – current period tax positions |  | 4 | 4
Total changes |  |  | 4
Unrecognized tax benefits – December 31 | 25 | 25 | 21
Amount that if recognized, would affect the effective tax rate or regulatory liability | 24 |  |
Valuation allowance | 1 |  |
Progress Energy |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 29 | 24 | 19
Gross decreases – tax positions in prior periods | (1) |  |
Gross increases – current period tax positions |  | 5 | 5
Total changes |  |  | 5
Unrecognized tax benefits – December 31 | 28 | 29 | 24
Amount that if recognized, would affect the effective tax rate or regulatory liability | 26 |  |
Duke Energy Progress |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 22 | 18 | 13
Gross decreases – tax positions in prior periods | (2) |  |
Gross increases – current period tax positions |  | 4 | 5
Total changes |  |  | 5
Unrecognized tax benefits – December 31 | 20 | 22 | 18
Amount that if recognized, would affect the effective tax rate or regulatory liability | 18 |  |
Duke Energy Florida |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 7 | 6 | 5
Gross increases – current period tax positions | 1 | 1 | 1
Total changes |  |  | 1
Unrecognized tax benefits – December 31 | 8 | 7 | 6
Amount that if recognized, would affect the effective tax rate or regulatory liability | 8 |  |
Duke Energy Ohio |  |  |
Unrecognized Tax Benefits [Roll Forward] |  |  |
Unrecognized tax benefits – January 1 | 2 | 2 | 1
Gross increases – current period tax positions |  |  | 1
Total changes |  |  | 1
Unrecognized tax benefits – December 31 | 2 | 2 | 2
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 | 3 | 2
Gross increases – current period tax positions |  |  | 1
Total changes |  |  | 1
Unrecognized tax benefits – December 31 | 3 | 3 | 3
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 | 13 | 11 | 9
Gross decreases – tax positions in prior periods | (1) |  |
Gross increases – current period tax positions |  | 2 | 2
Total changes |  |  | 2
Unrecognized tax benefits – December 31 | 12 | $ 13 | $ 11
Amount that if recognized, would affect the effective tax rate or regulatory liability | $ 11 |  |

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