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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 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.
(in millions)
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy Indiana

Balance at December 31, 2014(a)
$
8,466

 
$
3,428

 
$
4,711

 
$
3,905

 
$
806

 
$
27

 
$
32

Acquisitions
9

 
—

 
—

 
—

 
—

 
—

 
—

Accretion expense(b)
171

 
81

 
97

 
79

 
18

 
1

 
6

Liabilities settled(c)
(187
)
 
(60
)
 
(123
)
 
(32
)
 
(91
)
 
(1
)
 
(3
)
Liabilities incurred in the current year(d)(e)
983

 
178

 
270

 
270

 
—

 
116

 
418

Revisions in estimates of cash flows
48

 
(23
)
 
40

 
40

 
—

 
—

 
—

Balance at June 30, 2015
$
9,490

 
$
3,604

 
$
4,995

 
$
4,262

 
$
733

 
$
143

 
$
453

(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)
For the six months ended June 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.
(c)
Primarily relates to closure of ash basins in North Carolina and South Carolina and nuclear decommissioning of Crystal River Unit 3 in Florida.
(d)
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.
(e)
Retail cost recovery is believed to be probable and will be pursued through the normal ratemaking process with the NCUC, PSCSC, KPSC and IURC. Wholesale cost recovery, except for Duke Energy Indiana amounts, is believed to be probable and will be pursued through the normal ratemaking process with FERC.
The following table summarizes the associated long-lived assets related to ARO liabilities incurred during the six months ended June 30, 2015.
 
 
June 30, 2015
(in millions)
 
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Ohio

 
Duke Energy Indiana

Net property, plant and equipment
 
$
535

 
$
—

 
$
—

 
$
—

 
$
116

 
$
418

Regulatory Assets
 
448

 
178

 
270

 
270

 
—

 
—