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Asset Retirement Obligations | 9 Months Ended
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Sep. 30, 2020
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligations | ASSET RETIREMENT OBLIGATIONS The Duke Energy Registrants record AROs when there is a legal obligation to incur retirement costs associated with the retirement of a long-lived asset and the obligation can be reasonably estimated. Actual costs incurred could be materially different from current estimates that form the basis of the recorded AROs. The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets.
| September 30, 2020
|  |  | 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) | $ | 6,815 |  |  | $ | 2,658 |  |  | $ | 4,107 |  |  | $ | 3,606 |  |  | $ | 501 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Closure of ash impoundments | 6,458 |  |  | 3,049 |  |  | 2,172 |  |  | 2,150 |  |  | 22 |  |  | 51 |  |  | 1,186 |  |  | — |
Other | 381 |  |  | 67 |  |  | 76 |  |  | 44 |  |  | 32 |  |  | 40 |  |  | 28 |  |  | 17 |
Total ARO | $ | 13,654 |  |  | $ | 5,774 |  |  | $ | 6,355 |  |  | $ | 5,800 |  |  | $ | 555 |  |  | $ | 91 |  |  | $ | 1,214 |  |  | $ | 17 |
Less: Current portion | 742 |  |  | 267 |  |  | 297 |  |  | 297 |  |  | — |  |  | 7 |  |  | 170 |  |  | — |
Total noncurrent ARO | $ | 12,912 |  |  | $ | 5,507 |  |  | $ | 6,058 |  |  | $ | 5,503 |  |  | $ | 555 |  |  | $ | 84 |  |  | $ | 1,044 |  |  | $ | 17 |
(a) Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy. ARO Liability Rollforward 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, 2019(a) | $ | 13,318 |  |  | $ | 5,734 |  |  | $ | 6,471 |  |  | $ | 5,893 |  |  | $ | 578 |  |  | $ | 80 |  |  | $ | 832 |  |  | $ | 17 |
Accretion expense(b) | 408 |  |  | 195 |  |  | 187 |  |  | 171 |  |  | 16 |  |  | 3 |  |  | 22 |  |  | — |
Liabilities settled(c) | (540 | ) |  | (151 | ) |  | (333 | ) |  | (293 | ) |  | (40 | ) |  | (1 | ) |  | (56 | ) |  | — |
Liabilities incurred in the current year | 17 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Revisions in estimates of cash flows(d) | 451 |  |  | (4 | ) |  | 30 |  |  | 29 |  |  | 1 |  |  | 9 |  |  | 416 |  |  | — |
Balance at September 30, 2020 | $ | 13,654 |  |  | $ | 5,774 |  |  | $ | 6,355 |  |  | $ | 5,800 |  |  | $ | 555 |  |  | $ | 91 |  |  | $ | 1,214 |  |  | $ | 17 |
(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, 2020, 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.
(d) | Primarily relates to increases in closure estimates for certain ash impoundments as a result of certain changes in estimates and the impact of Hoosier Environmental Council’s petition filed with the court challenging the Indiana Department of Environmental Management’s partial approval of Duke Energy Indiana’s ash pond closure plan, new closure plan approvals, as well as increased post closure maintenance, landfill and beneficiation costs. See Note 4 for more information on Hoosier Environmental Council's petition. The incremental amount recorded represents the discounted cash flows for estimated closure costs based upon the probability weightings of the potential closure methods as evaluated on a site-by-site basis.
Asset retirement costs associated with the AROs for operating plants and retired plants are included in Net property, plant and equipment and Regulatory assets within Other Noncurrent Assets, respectively, on the Condensed Consolidated Balance Sheets.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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