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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Organization And Basis Of Presentation [Line Items]  
Schedule of Current and Noncurrent Assets and Liabilities
The following table provides detail of amounts included in Other within Current Assets or Current Liabilities on the Consolidated Balance Sheets.
 
 
 
December 31,
(in millions)
Location
 
2015

 
2014

Duke Energy
 
 
 
 
 
Accrued compensation
Current Liabilities
 
$
621

 
$
638

Duke Energy Carolinas
 
 
 
 
 
Accrued compensation  
Current Liabilities
 
$
213

 
$
216

Collateral liabilities  
Current Liabilities
 
141

 
128

Progress Energy  
  
 
  

 
  

Income taxes receivable
Current Assets
 
$
129

 
$
718

Customer deposits  
Current Liabilities
 
373

 
360

Derivative liabilities
Current Liabilities
 
201

 
271

Duke Energy Progress  
  
 
  

 
  

Income taxes receivable
Current Assets
 
$
111

 
$
272

Customer deposits  
Current Liabilities
 
141

 
135

Accrued compensation  
Current Liabilities
 
108

 
116

Derivative liabilities
Current Liabilities
 
76

 
108

Duke Energy Florida  
  
 
  

 
  

Income taxes receivable
Current Assets
 
$
—

 
$
177

Customer deposits  
Current Liabilities
 
232

 
225

Derivative liabilities
Current Liabilities
 
125

 
163

Duke Energy Ohio  
  
 
  

 
  

Income taxes receivable
Current Assets
 
$
59

 
$
40

Other receivable
Current Assets
 
33

 
39

Accrued litigation reserve
Current Liabilities
 
80

 
—

Collateral Liabilities
Current Liabilities
 
48

 
$
42

Duke Energy Indiana  
  
 
  

 
 
Income taxes receivable
Current Assets
 
$
—

 
$
98

Collateral liabilities
Current Liabilities
 
44

 
43
Schedule of Net Income Amounts Attributable to Controlling Interests
The following table presents Net Income Attributable to Duke Energy Corporation for continuing operations and discontinued operations for the years ended December 31, 2014 and 2013.
 
Years ended December 31,
 
2014
 
2013
 
Duke

Progress

 
Duke

Progress

(in millions)
Energy

Energy

 
Energy

Energy

Income from Continuing Operations
$
2,465

$
880

 
2,590

659

Income from Continuing Operations Attributable to Noncontrolling Interests
14

5


16

3

Income from Continuing Operations Attributable to Duke Energy Corporation
$
2,451

$
875


$
2,574

$
656

(Loss) Income From Discontinued Operations, net of tax
$
(576
)
$
(6
)
 
86

16

Loss from Discontinued Operations Attributable to Noncontrolling Interests, net of tax
(8
)
—

 
(5
)
—

(Loss) Income From Discontinued Operations Attributable to Duke Energy Corporation, net of tax
$
(568
)
$
(6
)

$
91

$
16

Net Income
$
1,889

$
874


$
2,676

$
675

Net Income Attributable to Noncontrolling Interests
6

5

 
11

3

Net Income Attributable to Duke Energy Corporation
$
1,883

$
869


$
2,665

$
672
Components Of Inventory
The components of inventory are presented in the tables below.
  
December 31, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)  
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Materials and supplies  
$
2,389

 
$
785

 
$
1,133

 
$
776

 
$
357

 
$
81

 
$
301

Coal held for electric generation  
1,114

 
451

 
370

 
192

 
178

 
16

 
267

Oil, gas and other fuel held for electric generation  
307

 
40

 
248

 
120

 
128

 
8

 
2

Total inventory  
$
3,810

 
$
1,276

 
$
1,751

 
$
1,088

 
$
663

 
$
105

 
$
570

  
December 31, 2014
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)  
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Materials and supplies  
$
2,102

 
$
719

 
$
981

 
$
676

 
$
305

 
$
67

 
$
258

Coal held for electric generation  
997

 
362

 
329

 
150

 
178

 
21

 
275

Oil, gas and other fuel held for electric generation  
360

 
43

 
280

 
140

 
140

 
9

 
4

Total inventory  
$
3,459

 
$
1,124

 
$
1,590

 
$
966

 
$
623

 
$
97

 
$
537
Schedule Of Property, Plant And Equipment
The composite weighted average depreciation rates, excluding nuclear fuel, are included in the table that follows.
  
Years Ended December 31,
  
2015

 
2014

 
2013

Duke Energy  
2.9
%
 
2.8
%
 
2.8
%
Duke Energy Carolinas  
2.8
%
 
2.7
%
 
2.8
%
Progress Energy  
2.6
%
 
2.5
%
 
2.5
%
Duke Energy Progress  
2.6
%
 
2.5
%
 
2.5
%
Duke Energy Florida  
2.7
%
 
2.7
%
 
2.4
%
Duke Energy Ohio  
2.7
%
 
2.3
%
 
3.3
%
Duke Energy Indiana  
3.0
%
 
3.0
%
 
2.8
%
The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants.
 
December 31, 2015
 
Estimated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Useful
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Life
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
(Years)
 
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Land  
 
 
$
1,466

 
$
407

 
$
719

 
$
392

 
$
327

 
$
118

 
$
108

Plant – Regulated  
 
 
  

 
  

 
  

 
  

 
  

 
  

 
  

Electric generation, distribution and transmission  
8 - 100
 
87,593

 
33,623

 
36,422

 
22,888

 
13,534

 
4,429

 
13,118

Natural gas transmission and distribution  
12 - 67
 
2,322

 
—

 
—

 
—

 
—

 
2,322

 
—

Other buildings and improvements  
15 - 100
 
1,480

 
477

 
621

 
294

 
322

 
204

 
179

Plant – Nonregulated  
  
 
  

 
  

 
  

 
  

 
  

 
  

 
  

Electric generation, distribution and transmission  
1 - 30
 
3,348

 
—

 
—

 
—

 
—

 
—

 
—

Other buildings and improvements  
5 - 50
 
2,363

 
—

 
—

 
—

 
—

 
—

 
—

Nuclear fuel  
  
 
3,194

 
1,827

 
1,367

 
1,367

 
—

 
—

 
—

Equipment  
3 - 38
 
1,791

 
368

 
530

 
398

 
132

 
344

 
173

Construction in process  
  
 
4,525

 
1,860

 
1,827

 
1,118

 
709

 
180

 
214

Other  
2 - 60
 
4,744

 
836

 
1,180

 
856

 
319

 
153

 
215

Total property, plant and equipment(a)(d)
 
 
112,826

 
39,398

 
42,666

 
27,313

 
15,343

 
7,750

 
14,007

Total accumulated depreciation – regulated(b)(c)(d)
 
 
(35,367
)
 
(13,521
)
 
(14,867
)
 
(10,141
)
 
(4,720
)
 
(2,507
)
 
(4,484
)
Total accumulated depreciation – nonregulated(c)(d)
 
 
(2,298
)
 
—

 
—

 
—

 
—

 
—

 
—

Generation facilities to be retired, net
 
 
548

 
—

 
548

 
548

 
—

 
—

 
—

Total net property, plant and equipment  
 
 
$
75,709


$
25,877


$
28,347


$
17,720


$
10,623


$
5,243

 
$
9,523

(a)
Includes capitalized leases of $1,470 million, $40 million, $302 million, $144 million, $158 million, $96 million, and $39 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, and Duke Energy Indiana, respectively, primarily within Plant - Regulated. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $85 million, $7 million and $78 million, respectively, of accumulated amortization of capitalized leases.
(b)
Includes $1,621 million, $976 million, $645 million and $645 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(c)
Includes accumulated amortization of capitalized leases of $58 million, $11 million, $27 million and $7 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana, respectively.
(d)
Includes gross property, plant and equipment cost of consolidated VIEs of $2,033 million and accumulated depreciation of consolidated VIEs of $327 million at Duke Energy.
 
December 31, 2014
 
Estimated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Useful
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Life
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
(Years)
 
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Land  
 
 
$
1,459

 
$
403

 
$
704

 
$
380

 
$
324

 
$
114

 
$
108

Plant – Regulated  
 
 
  

 
  

 
  

 
  

 
  

 
  

 
  

Electric generation, distribution and transmission  
2 - 138
 
82,206

 
31,751

 
33,672

 
20,616

 
13,056

 
3,956

 
11,911

Natural gas transmission and distribution  
12 - 67
 
2,230

 
—

 
—

 
—

 
—

 
2,230

 
—

Other buildings and improvements  
9 - 100
 
1,445

 
465

 
607

 
286

 
318

 
200

 
173

Plant – Nonregulated  
  
 
  

 
  

 
  

 
  

 
  

 
  

 
  

Electric generation, distribution and transmission  
1- 30
 
2,380

 
—

 
—

 
—

 
—

 
—

 
—

Other buildings and improvements  
5 - 50
 
2,498

 
—

 
—

 
—

 
—

 
—

 
—

Nuclear fuel  
  
 
2,865

 
1,676

 
1,190

 
1,190

 
—

 
—

 
—

Equipment  
3 - 34
 
1,762

 
341

 
506

 
388

 
118

 
330

 
166

Construction in process  
  
 
4,519

 
2,081

 
1,215

 
908

 
307

 
97

 
481

Other  
5 - 80
 
3,497

 
655

 
756

 
439

 
310

 
214

 
195

Total property, plant and equipment(a)(d)
 
 
104,861

 
37,372

 
38,650

 
24,207

 
14,433

 
7,141

 
13,034

Total accumulated depreciation – regulated(b)(c)(d)
 
 
(32,628
)
 
(12,700
)
 
(13,506
)
 
(9,021
)
 
(4,478
)
 
(2,213
)
 
(4,219
)
Total accumulated depreciation – nonregulated(c)(d)
 
 
(2,196
)
 
—

 
—

 
—

 
—

 
—

 
—

Generation facilities to be retired, net
 
 
9

 
—

 
—

 
—

 
—

 
9

 
—

Total net property, plant and equipment  
 
 
$
70,046

 
$
24,672

 
$
25,144

 
$
15,186

 
$
9,955

 
$
4,937

 
$
8,815

(a)
Includes capitalized leases of $1,548 million, $40 million, $315 million, $146 million, $169 million, $98 million, and $30 million at Duke Energy, Duke Energy Carolinas, Progress Energy, Duke Energy Progress, Duke Energy Florida, Duke Energy Ohio, and Duke Energy Indiana, respectively, primarily in regulated plant. The Progress Energy, Duke Energy Progress and Duke Energy Florida amounts are net of $72 million, $5 million and $67 million, respectively, of accumulated amortization of capitalized leases.
(b)
Includes $1,408 million, $847 million, $561 million and $561 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(c)
Includes accumulated amortization of capitalized leases of $52 million, $8 million, $25 million and $6 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana, respectively.
(d)
Includes gross property, plant and equipment cost of consolidated VIEs of $1,873 million and accumulated depreciation of consolidated VIEs of $257 million at Duke Energy.
Schedule of Allowance for Doubtful Accounts
Allowances for doubtful accounts are presented in the following table.
  
December 31,
(in millions)  
2015

 
2014

 
2013

Allowance for Doubtful Accounts  
  
 
  
 
  
Duke Energy  
$
18

 
17

 
30

Duke Energy Carolinas  
3

 
3

 
3

Progress Energy  
6

 
8

 
14

Duke Energy Progress  
4

 
7

 
10

Duke Energy Florida  
2

 
2

 
4

Duke Energy Ohio  
2

 
2

 
2

Duke Energy Indiana  
1

 
1

 
1

Allowance for Doubtful Accounts – VIEs  
  
 
  
 
  
Duke Energy  
$
53

 
51

 
43

Duke Energy Carolinas  
7

 
6

 
6

Progress Energy  
8

 
8

 
—

Duke Energy Progress  
5

 
5

 
—

Duke Energy Florida  
3

 
3

 
—
Schedule of Excise Taxes
Excise taxes accounted for on a gross basis as both operating revenues and property and other taxes in the Consolidated Statements of Operations were as follows.
  
Years Ended December 31,
(in millions)  
2015

 
2014

 
2013

Duke Energy  
$
396

 
$
498

 
$
602

Duke Energy Carolinas  
31

 
94

 
164

Progress Energy  
229

 
263

 
304

Duke Energy Progress  
16

 
56

 
115

Duke Energy Florida  
213

 
207

 
189

Duke Energy Ohio  
102

 
103

 
105

Duke Energy Indiana  
34

 
38

 
29
Unbilled Revenues [Member]  
Organization And Basis Of Presentation [Line Items]  
Schedule Of Unbilled Revenues Within Receivables and Restricted Receivables
Unbilled revenues are included within Receivables and Restricted receivables of variable interest entities on the Consolidated Balance Sheets as shown in the following table. This table excludes amounts included in assets held for sale (AHFS) at December 31, 2014.
  
December 31,
(in millions)  
2015

 
2014

Duke Energy  
$
748

 
$
827

Duke Energy Carolinas  
283

 
295

Progress Energy  
172

 
217

Duke Energy Progress  
102

 
135

Duke Energy Florida  
70

 
82

Duke Energy Ohio  
3

 
—

Duke Energy Indiana  
31

 
27


Additionally, Duke Energy Ohio and Duke Energy Indiana sell, on a revolving basis, nearly all of their retail accounts receivable, including receivables for unbilled revenues, to an affiliate, Cinergy Receivables Company, LLC (CRC) and account for the transfers of receivables as sales. Accordingly, the receivables sold are not reflected on the Consolidated Balance Sheets of Duke Energy Ohio and Duke Energy Indiana. See Note 17 for further information. These receivables for unbilled revenues are shown in the table below.
  
December 31,
(in millions)
2015

 
2014

Duke Energy Ohio
$
71

 
$
79

Duke Energy Indiana
97

 
112