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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2014
Asset Retirement Obligations [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 impacted by the Coal Ash Act and the agreement with SCDHEC.
(in millions)
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

Balance at December 31, 2013(a)(b)
$
4,958

 
$
1,594

 
$
2,570

 
$
1,737

Accretion expense(c)
164

 
71

 
91

 
63

Liabilities settled
(56
)
 
—

 
(52
)
 
—

Liabilities incurred in the current year(d)
3,433

 
2,026

 
1,406

 
1,406

Balance at September 30, 2014
$
8,499

 
$
3,691

 
$
4,015

 
$
3,206

(a)
The balance as of December 31, 2013 primarily relates to decommissioning nuclear power facilities, asbestos removal and closure of landfills at fossil generation facilities.
(b)
The balance at December 31, 2013 includes $8 million reported in Other current liabilities on the Condensed Consolidated Balance Sheets at Duke Energy, Progress Energy and Duke Energy Progress.
(c)
Substantially all accretion expense for the nine months ended September 30, 2014 relates to Duke Energy's regulated electric operations from previously established asset retirement obligations and has been deferred in accordance with regulatory accounting treatment.
(d)
Amounts relate to asset obligations recorded in the third quarter of 2014 as a result of the Coal Ash Act and an agreement with the SCDHEC related to the W.S Lee Steam Station.