v3.3.0.814

Asset Retirement Obligations (Tables) | 9 Months Ended
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Sep. 30, 2015
Asset Retirement Obligation [Abstract] |
Schedule of Change in Asset Retirement Obligation | The following table presents changes in the liability associated with asset retirement obligations for Duke Energy and the Subsidiary Registrants.
|  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |  |  | Duke |
| Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |  |  | Energy |
(in millions) | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Florida |  |  | Ohio |  |  | Indiana |
Balance at December 31, 2014(a) | $ | 8,466 |  |  | $ | 3,428 |  |  | $ | 4,711 |  |  | $ | 3,905 |  |  | $ | 806 |  |  | $ | 27 |  |  | $ | 32 |
Acquisitions(b) | 213 |  |  | — |  |  | 204 |  |  | 204 |  |  | — |  |  | — |  |  | — |
Accretion expense(c) | 278 |  |  | 123 |  |  | 150 |  |  | 123 |  |  | 26 |  |  | 2 |  |  | 11 |
Liabilities settled(d) | (274 | ) |  | (107 | ) |  | (153 | ) |  | (53 | ) |  | (100 | ) |  | (2 | ) |  | (12 | )
Liabilities incurred in the current year(e) | 983 |  |  | 178 |  |  | 270 |  |  | 270 |  |  | — |  |  | 116 |  |  | 418 |
Revisions in estimates of cash flows | 47 |  |  | (23 | ) |  | 40 |  |  | 40 |  |  | — |  |  | — |  |  | — |
Balance at September 30, 2015 | $ | 9,713 |  |  | $ | 3,599 |  |  | $ | 5,222 |  |  | $ | 4,489 |  |  | $ | 732 |  |  | $ | 143 |  |  | $ | 449 |
(a) | Primarily relates to decommissioning nuclear power facilities, closure of ash basins in North Carolina and South Carolina, asbestos removal, closure of landfills at fossil generation facilities, retirement of natural gas mains and removal of renewable energy generation assets.
(b) | Primarily relates to the NCEMPA acquisition. See footnote 2 for additional information.
(c) | For the nine months ended September 30, 2015, substantially all accretion expense relates to previously established asset retirement obligations from Duke Energy's regulated electric operations and has been deferred in accordance with regulatory accounting treatment.
(d) | Primarily relates to ash basin closures in North Carolina and South Carolina and nuclear decommissioning of Crystal River Unit 3 in Florida.
(e) | Primarily relates to amounts recorded in the second quarter of 2015 as a result of the EPA's rule for disposal of CCR as solid waste.
The following table summarizes the associated long-lived assets related to ARO liabilities incurred during the nine months ended September 30, 2015.
|  | September 30, 2015
|  |  |  | Duke |  |  |  |  | Duke |  |  | Duke |  |  | Duke |
|  | Duke |  |  | Energy |  |  | Progress |  |  | Energy |  |  | Energy |  |  | Energy |
(in millions) |  | Energy |  |  | Carolinas |  |  | Energy |  |  | Progress |  |  | Ohio |  |  | Indiana |
Net property, plant and equipment |  | $ | 535 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 116 |  |  | $ | 418 |
Regulatory Assets |  | 448 |  |  | 178 |  |  | 270 |  |  | 270 |  |  | — |  |  | — |

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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