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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2024
Asset Retirement Obligation [Abstract] |
Schedule of Asset Retirement Obligations | The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets.
| June 30, 2024
|  |  | 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(a) | $ | 4,608 |  |  | $ | 1,999 |  |  | $ | 2,603 |  |  | $ | 2,455 |  |  | $ | 148 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Closure of ash impoundments | 5,473 |  |  | 2,058 |  |  | 2,091 |  |  | 2,067 |  |  | 24 |  |  | 71 |  |  | 1,253 |  |  | — |
Other | 273 |  |  | 55 |  |  | 97 |  |  | 34 |  |  | 63 |  |  | 65 |  |  | 29 |  |  | 27 |
Total ARO | $ | 10,354 |  |  | $ | 4,112 |  |  | $ | 4,791 |  |  | $ | 4,556 |  |  | $ | 235 |  |  | $ | 136 |  |  | $ | 1,282 |  |  | $ | 27 |
Less: Current portion | 636 |  |  | 252 |  |  | 215 |  |  | 214 |  |  | 1 |  |  | 7 |  |  | 162 |  |  | — |
Total noncurrent ARO | $ | 9,718 |  |  | $ | 3,860 |  |  | $ | 4,576 |  |  | $ | 4,342 |  |  | $ | 234 |  |  | $ | 129 |  |  | $ | 1,120 |  |  | $ | 27 |
Schedule of Change in Asset Retirement Obligation | 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, 2023(a) | $ | 9,156 |  |  | $ | 4,013 |  |  | $ | 4,145 |  |  | $ | 3,870 |  |  | $ | 275 |  |  | $ | 136 |  |  | $ | 809 |  |  | $ | 26 |
Accretion expense(b) | 204 |  |  | 90 |  |  | 96 |  |  | 91 |  |  | 5 |  |  | 3 |  |  | 17 |  |  | 1 |
Liabilities settled(c) | (306) |  |  | (95) |  |  | (167) |  |  | (120) |  |  | (47) |  |  | (3) |  |  | (40) |  |  | — |
Revisions in estimates of cash flows(d) | 1,300 |  |  | 104 |  |  | 717 |  |  | 715 |  |  | 2 |  |  | — |  |  | 496 |  |  | — |
Balance at June 30, 2024 | $ | 10,354 |  |  | $ | 4,112 |  |  | $ | 4,791 |  |  | $ | 4,556 |  |  | $ | 235 |  |  | $ | 136 |  |  | $ | 1,282 |  |  | $ | 27 |
(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 six months ended June 30, 2024, substantially all accretion expense relates to Duke Energy's regulated operations and 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 increases primarily relate to additional scope requirements to regulate the disposal of CCR in landfills and surface impoundments as a result of the 2024 CCR Rule, including an increase in groundwater monitoring wells.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481850/410-20-50-1 + Details
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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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