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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation [Abstract]  
Schedule of Asset Retirement Obligations by Category
The following table presents the AROs recorded on the Consolidated Balance Sheets.
 
December 31, 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)
$
5,204

 
$
1,834

 
$
3,172

 
$
2,454

 
$
717

 
$
—

 
$
—

Closure of Ash Impoundments
5,150

 
2,032

 
2,228

 
2,209

 
19

 
43

 
847

Other(b)
257

 
29

 
75

 
34

 
42

 
34

 
19

Total asset retirement obligation
$
10,611

 
$
3,895

 
$
5,475

 
$
4,697

 
$
778

 
$
77

 
$
866

Less: current portion
411

 
222

 
189

 
189

 
—

 
—

 
—

Total noncurrent asset retirement obligation
$
10,200

 
$
3,673

 
$
5,286

 
$
4,508

 
$
778

 
$
77

 
$
866

(a)
The Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy.
(b)
Primarily includes obligations related to asbestos removal and the closure of certain landfills at fossil generation facilities. Duke Energy Ohio also includes AROs related to the retirement of natural gas mains and services. Duke Energy includes AROs related to the removal of renewable energy generation assets and Piedmont's underground natural gas mains and services.
Public Utilities General Disclosures
The following table presents the fair value of NDTF assets legally restricted for purposes of settling AROs associated with nuclear decommissioning. Duke Energy Florida is actively decommissioning Crystal River Unit 3 and was granted an exemption from the NRC which allows for use of the NDTF for all aspects of nuclear decommissioning. Therefore, the entire balance of Duke Energy Florida's NDTF may be applied toward license termination, spent fuel and site restoration costs incurred to decommission Crystal River Unit 3.
 
December 31,
(in millions)
2016
 
2015
Duke Energy
$
5,099

 
$
4,670

Duke Energy Carolinas
2,882

 
2,686

Duke Energy Progress
2,217

 
1,984

The following table summarizes information about the most recent site-specific nuclear decommissioning cost studies. Decommissioning costs in the table below are presented in dollars of the year of the cost study and include costs to decommission plant components not subject to radioactive contamination.
 
Annual Funding

 
Decommissioning

 
 
(in millions)
Requirement(a)

 
Costs(a)(b)

 
Year of Cost Study
Duke Energy
$
14

 
$
8,150

 
2013 and 2014
Duke Energy Carolinas
—

 
3,420

 
2013
Duke Energy Progress
14

 
3,550

 
2014
Duke Energy Florida
—

 
1,180

 
2013
(a)
Amounts for Progress Energy equal the sum of Duke Energy Progress and Duke Energy Florida.
(b)
Amounts include the Subsidiary Registrant's ownership interest in jointly owned reactors. Other joint owners are responsible for decommissioning costs related to their interest in the reactors.
The following table includes the current expiration of nuclear operating licenses.
Unit
Year of Expiration
Duke Energy Carolinas
 
Catawba Units 1 and 2
2043
McGuire Unit 1
2041
McGuire Unit 2
2043
Oconee Units 1 and 2
2033
Oconee Unit 3
2034
Duke Energy Progress
 
Brunswick Unit 1
2036
Brunswick Unit 2
2034
Harris
2046
Robinson
2030
Rollforward Schedule of Asset Retirement Obligations
The following table presents changes in the liability associated with AROs.
 
 
 
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
$
8,464

 
$
3,428

 
$
4,711

 
$
3,905

 
$
806

 
$
27

 
$
32

Acquisitions(a)
226

 
—

 
226

 
204

 
23

 
—

 
—

Accretion expense(b)
380

 
165

 
203

 
169

 
34

 
4

 
15

Liabilities settled(c)  
(422
)
 
(200
)
 
(195
)
 
(125
)
 
(70
)
 
(4
)
 
(23
)
Liabilities incurred in the current year(d)
1,016

 
178

 
282

 
282

 
—

 
116

 
418

Revisions in estimates of cash flows
585

 
347

 
142

 
132

 
9

 
(18
)
 
83

Balance at December 31, 2015
10,249

 
3,918

 
5,369

 
4,567

 
802

 
125

 
525

Acquisitions
22

 
—

 
2

 
—

 
2

 
—

 
—

Accretion expense(b)
400

 
187

 
230

 
194

 
35

 
5

 
24

Liabilities settled(c)  
(613
)
 
(287
)
 
(272
)
 
(212
)
 
(60
)
 
(5
)
 
(49
)
Liabilities incurred in the current year
51

 
—

 
3

 
3

 
—

 
—

 
29

Revisions in estimates of cash flows
502

 
77

 
143

 
145

 
(1
)
 
(48
)
 
337

Balance at December 31, 2016
$
10,611


$
3,895


$
5,475


$
4,697


$
778


$
77


$
866

(a)
Duke Energy Progress amount relates to the NCEMPA acquisition. See Note 2 for additional information.
(b)
Substantially all accretion expense for the years ended December 31, 2016 and 2015 relates to Duke Energy’s regulated electric operations and has been deferred in accordance with regulatory accounting treatment.
(c)
Amounts primarily relate to ash impoundment closures and nuclear decommissioning of Crystal River Unit 3.
(d)
Amounts primarily relate to AROs recorded as a result of the EPA's rule for disposal of CCR.