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Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2025
Asset Retirement Obligation Disclosure [Abstract] |
Schedule of Asset Retirement Obligations | The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets.
| September 30, 2025
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Decommissioning of nuclear power facilities | $ | 4,625 |  |  | $ | 2,131 |  |  | $ | 2,479 |  |  | $ | 2,400 |  |  | $ | 79 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Closure of ash impoundments | 4,688 |  |  | 1,648 |  |  | 1,868 |  |  | 1,844 |  |  | 24 |  |  | 65 |  |  | 1,107 |  |  | — |
Other | 331 |  |  | 75 |  |  | 135 |  |  | 43 |  |  | 92 |  |  | 68 |  |  | 29 |  |  | 26 |
Total ARO | $ | 9,644 |  |  | $ | 3,854 |  |  | $ | 4,482 |  |  | $ | 4,287 |  |  | $ | 195 |  |  | $ | 133 |  |  | $ | 1,136 |  |  | $ | 26 |
Less: Current portion | 592 |  |  | 247 |  |  | 208 |  |  | 206 |  |  | 2 |  |  | 8 |  |  | 130 |  |  | — |
Total noncurrent ARO | $ | 9,052 |  |  | $ | 3,607 |  |  | $ | 4,274 |  |  | $ | 4,081 |  |  | $ | 193 |  |  | $ | 125 |  |  | $ | 1,006 |  |  | $ | 26 |
Schedule of Change in Liability Associated with Asset Retirement Obligations | The following table presents the change in liability associated with AROs for the Duke Energy Registrants.
|  |  | Duke |  |  |  | Duke |  | Duke |  | Duke |  | Duke |  |
| Duke |  | Energy |  | Progress |  | Energy |  | Energy |  | Energy |  | Energy |  |
(in millions) | Energy |  | Carolinas |  | Energy |  | Progress |  | Florida |  | Ohio |  | Indiana |  | Piedmont
Balance at December 31, 2024(a) | $ | 9,988 |  |  | $ | 3,990 |  |  | $ | 4,548 |  |  | $ | 4,334 |  |  | $ | 214 |  |  | $ | 139 |  |  | $ | 1,268 |  |  | $ | 24 |
Accretion expense(b) | 357 |  |  | 141 |  |  | 164 |  |  | 158 |  |  | 6 |  |  | 5 |  |  | 49 |  |  | 2 |
Liabilities settled(c) | (435) |  |  | (171) |  |  | (180) |  |  | (149) |  |  | (31) |  |  | (5) |  |  | (79) |  |  | — |
Revisions in estimates of cash flows(d) | (266) |  |  | (106) |  |  | (50) |  |  | (56) |  |  | 6 |  |  | (6) |  |  | (102) |  |  | — |
Balance at September 30, 2025 | $ | 9,644 |  |  | $ | 3,854 |  |  | $ | 4,482 |  |  | $ | 4,287 |  |  | $ | 195 |  |  | $ | 133 |  |  | $ | 1,136 |  |  | $ | 26 |
(a)Primarily relates to decommissioning nuclear power facilities, closure of ash impoundments, asbestos removal, closure of landfills at fossil generation facilities, retirement of natural gas mains and removal of renewable energy generation assets. (b)For the nine months ended September 30, 2025, substantially all accretion expense has been deferred in accordance with regulatory accounting treatment. (c)Primarily relates to ash impoundment closures and nuclear decommissioning. (d)The revision amounts represent the change in discounted cash flows for estimated closure costs as evaluated on a site-by-site basis. The decreases primarily relate to lower third-party markup and a shift in timing of costs to future years.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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