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Asset Retirement Obligations (Tables)
 9 Months Ended
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

 
—

 
—