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Asset Retirement Obligations (Tables) | 6 Months Ended
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Jun. 30, 2018
Asset Retirement Obligation [Abstract] |
Schedule of Asset Retirement Obligations | The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets.
| June 30, 2018
|  |  | 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) | $ | 5,319 |  |  | $ | 2,002 |  |  | $ | 3,158 |  |  | $ | 2,621 |  |  | $ | 536 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Closure of Ash Impoundments | 4,843 |  |  | 1,761 |  |  | 2,202 |  |  | 2,178 |  |  | 24 |  |  | 44 |  |  | 836 |  |  | — |
Other | 307 |  |  | 56 |  |  | 78 |  |  | 36 |  |  | 42 |  |  | 45 |  |  | 20 |  |  | 15 |
Total ARO | $ | 10,469 |  |  | $ | 3,819 |  |  | $ | 5,438 |  |  | $ | 4,835 |  |  | $ | 602 |  |  | $ | 89 |  |  | $ | 856 |  |  | $ | 15 |
Less: current portion | 716 |  |  | 227 |  |  | 386 |  |  | 381 |  |  | 5 |  |  | 5 |  |  | 98 |  |  | — |
Total noncurrent ARO | $ | 9,753 |  |  | $ | 3,592 |  |  | $ | 5,052 |  |  | $ | 4,454 |  |  | $ | 597 |  |  | $ | 84 |  |  | $ | 758 |  |  | $ | 15 |
(a) Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy.
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, 2017(a) | $ | 10,175 |  |  | $ | 3,610 |  |  | $ | 5,414 |  |  | $ | 4,673 |  |  | $ | 742 |  |  | $ | 84 |  |  | $ | 781 |  |  | $ | 15 |
Accretion expense(b) | 212 |  |  | 89 |  |  | 113 |  |  | 97 |  |  | 16 |  |  | 2 |  |  | 14 |  |  | — |
Liabilities settled(c) | (245 | ) |  | (114 | ) |  | (108 | ) |  | (89 | ) |  | (19 | ) |  | (2 | ) |  | (21 | ) |  | — |
Liabilities incurred in the current year | 8 |  |  | 8 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Revisions in estimates of cash flows(d) | 319 |  |  | 226 |  |  | 19 |  |  | 154 |  |  | (137 | ) |  | 5 |  |  | 82 |  |  | — |
Balance at June 30, 2018 | $ | 10,469 |  |  | $ | 3,819 |  |  | $ | 5,438 |  |  | $ | 4,835 |  |  | $ | 602 |  |  | $ | 89 |  |  | $ | 856 |  |  | $ | 15 |
(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, 2018, substantially all accretion expense relates to Duke Energy's regulated electric operations and has been deferred in accordance with regulatory accounting treatment.
(c) | Primarily relates to ash impoundment closures and nuclear decommissioning of Crystal River Unit 3.
(d) | Primarily relates to increases in groundwater monitoring estimates for closure of ash impoundments and a reduction for nuclear decommissioning at Crystal River Unit 3 compared to original estimates.

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