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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2016
Asset Retirement Obligation [Abstract]  
Schedule of Asset Retirement Obligations [Table Text Block]
The following table presents the AROs recorded on the Condensed Consolidated Balance Sheets.
 
September 30, 2016
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Decommissioning of Nuclear Power Facilities(a)
$
5,163

 
$
1,808

 
$
3,153

 
$
2,428

 
$
725

 
$
—

 
$
—

Closure of Ash Impoundments
5,411

 
2,089

 
2,418

 
2,398

 
20

 
77

 
828

Other
256

 
28

 
86

 
33

 
53

 
31

 
19

Total asset retirement obligation
$
10,830

 
$
3,925

 
$
5,657

 
$
4,859

 
$
798

 
$
108

 
$
847

Less: current portion
539

 
303

 
236

 
236

 
—

 
—

 
—

Total noncurrent asset retirement obligation
$
10,291


$
3,622


$
5,421


$
4,623


$
798


$
108


$
847

(a)    The 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 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, 2015(a)
$
10,264

 
$
3,918

 
$
5,369

 
$
4,567

 
$
802

 
$
125

 
$
525

Accretion expense(b)
290

 
141

 
171

 
144

 
28

 
4

 
16

Liabilities settled(c)
(443
)
 
(204
)
 
(203
)
 
(163
)
 
(41
)
 
(4
)
 
(31
)
Liabilities incurred in the current year
13

 
—

 
3

 
3

 
—

 
—

 
—

Revisions in estimates of cash flows
706

 
70

 
317

 
308

 
9

 
(17
)
 
337

Balance at September 30, 2016
$
10,830

 
$
3,925

 
$
5,657

 
$
4,859

 
$
798

 
$
108

 
$
847

(a)
Primarily relates to decommissioning nuclear power facilities, closure of ash basins, asbestos removal, closure of landfills at fossil generation facilities, retirement of natural gas mains and removal of renewable energy generation assets.
(b)
For the nine months ended September 30, 2016, 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.