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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligations [Line Items]  
Schedule of Asset Retirement Obligations by Category
The following table presents the AROs recorded on the Consolidated Balance Sheets.
 
December 31, 2017
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Decommissioning of nuclear power facilities(a)
$
5,371

 
$
1,944

 
$
3,246

 
$
2,564

 
$
681

 
$
—

 
$
—

 
$
—

Closure of ash impoundments
4,525

 
1,629

 
2,094

 
2,075

 
19

 
39

 
763

 
—

Other(b)
279

 
37

 
74

 
34

 
42

 
45

 
18

 
15

Total asset retirement obligation
$
10,175

 
$
3,610

 
$
5,414

 
$
4,673

 
$
742

 
$
84

 
$
781


$
15

Less: current portion
689

 
337

 
295

 
295

 
—

 
3

 
54

 
—

Total noncurrent asset retirement obligation
$
9,486

 
$
3,273

 
$
5,119

 
$
4,378

 
$
742

 
$
81

 
$
727


$
15

(a)
Duke Energy amount includes purchase accounting adjustments related to the merger with Progress Energy.
(b)
Primarily includes obligations related to asbestos removal. Duke Energy Ohio and Piedmont also include AROs related to the retirement of natural gas mains and services. Duke Energy includes AROs related to the removal of renewable energy generation assets.
Public Utilities General Disclosures
The following table summarizes information about the most recent site-specific nuclear decommissioning cost studies. Decommissioning costs in the table below are stated in 2013 or 2014 dollars, depending on 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 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. 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. See Note 16 for additional information related to the fair value of the Duke Energy Registrants' NDTFs.
 
December 31,
(in millions)
2017
 
2016
Duke Energy
$
5,864

 
$
5,099

Duke Energy Carolinas
3,321

 
2,882

Duke Energy Progress
2,543

 
2,217

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 tables present 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, 2015
$
10,249

 
$
3,918

 
$
5,369

 
$
4,567

 
$
802

 
$
125

 
$
525

Acquisitions(a)
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

Accretion expense(b)
435

 
184

 
228

 
195

 
33

 
3

 
32

Liabilities settled(c)  
(619
)
 
(282
)
 
(270
)
 
(204
)
 
(65
)
 
(7
)
 
(49
)
Liabilities incurred in the current year(d)
51

 
5

 
—

 
—

 
—

 
7

 
29

Revisions in estimates of cash flows
(303
)
 
(192
)
 
(19
)
 
(15
)
 
(4
)
 
4

 
(97
)
Balance at December 31, 2017
$
10,175


$
3,610


$
5,414


$
4,673


$
742


$
84


$
781

(a)
Duke Energy amount relates to the Piedmont acquisition. See Note 2 for additional information.
(b)
Substantially all accretion expense for the years ended December 31, 2017, and 2016 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 state agency closure requirements at Duke Energy Indiana.
Piedmont Natural Gas [Member]  
Asset Retirement Obligations [Line Items]  
Rollforward Schedule of Asset Retirement Obligations
(in millions)
 
Piedmont
Balance at October 31, 2015
 
$
20

Accretion expense
 
1

Liabilities settled
 
(7
)
Liabilities incurred in the current year
 
6

Revisions in estimates of cash flows
 
(6
)
Balance at October 31, 2016
 
14

Liabilities settled
 
(1
)
Liabilities incurred in the current year
 
1

Balance at December 31, 2016
 
14

Accretion expense
 
1

Liabilities settled
 
(8
)
Liabilities incurred in the current year
 
8

Balance at December 31, 2017
 
$
15