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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Organization And Basis Of Presentation [Line Items]  
Schedule of Current and Noncurrent Assets and Liabilities
Other within Current Assets includes the current portion of deferred tax assets, which are disclosed in Note 22. Additionally, the following are included in Other within Current Assets or Current Liabilities in the Consolidated Balance Sheets of the Duke Energy Registrants at December 31, 2014 and 2013. The amounts presented exceeded 5 percent of current assets or 5 percent of current liabilities unless otherwise noted.
 
 
 
December 31,
(in millions)
Location
 
2014

 
2013

Duke Energy
 
 
 
 
 
Accrued compensation
Current Liabilities
 
$
638

 
$
621

Duke Energy Carolinas
 
 
 
 
 
Accrued compensation  
Current Liabilities
 
$
216

 
$
198

Collateral liabilities  
Current Liabilities
 
128

 
120

Progress Energy  
  
 
  

 
  

Income taxes receivable(b)
Current Assets
 
$
718

 
$
119

Customer deposits  
Current Liabilities
 
360

 
349

Accrued compensation(a)
Current Liabilities
 
174

 
214

Derivative liabilities(b)
Current Liabilities
 
271

 
—

Duke Energy Progress  
  
 
  

 
  

Income taxes receivable(b)
Current Assets
 
$
272

 
$
15

Customer deposits  
Current Liabilities
 
135

 
129

Accrued compensation  
Current Liabilities
 
116

 
121

Derivative liabilities(b)
Current Liabilities
 
108

 
38

Duke Energy Florida  
  
 
  

 
  

Income taxes receivable(b)
Current Assets
 
$
177

 
$
65

Customer deposits  
Current Liabilities
 
225

 
220

Accrued compensation(a)
Current Liabilities
 
57

 
65

Derivative liabilities(b)
Current Liabilities
 
163

 
—

Duke Energy Ohio  
  
 
  

 
  

Collateral assets(a)
Current Assets
 
$
13

 
$
122

Duke Energy Indiana  
  
 
  

 
  

Income taxes receivable  
Current Assets
 
$
98

 
$
56

Accrued compensation(a)
Current Liabilities
 
25

 
25

Collateral liabilities
Current Liabilities
 
43

 
40

(a) Does not exceed 5 percent of total current assets or liabilities, as appropriate, on the Consolidated Balance Sheets at December 31, 2014.
(b) Does not exceed 5 percent of total current assets or liabilities, as appropriate, on the Consolidated Balance Sheets at December 31, 2013.
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.
 
Years ended December 31,
 
2014
 
2013
 
2012
(in millions)
Duke Energy

Progress Energy

 
Duke Energy

Progress Energy

 
Duke Energy

Progress Energy

Income from Continuing Operations
$
2,465

$
880

 
$
2,590

$
659

 
1,611

355

Income of Continuing Operations Attributable to Noncontrolling Interests
14

5


16

3


18

7

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

$
875

 
$
2,574

$
656


$
1,593

$
348

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

$
16

 
171

52

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

 
(5
)
—

 
(4
)
—

(Loss) Income From Discontinued Operations Attributable to Duke Energy Corporation, net of tax
$
(568
)
$
(6
)
 
$
91

$
16


$
175

$
52

Net Income
$
1,889

$
874

 
$
2,676

$
675


$
1,782

$
407

Net Income Attributable to Noncontrolling Interest
6

5

 
11

3

 
14

7

Net Income Attributable to Duke Energy Corporation
$
1,883

$
869

 
$
2,665

$
672


$
1,768

$
400
Components Of Inventory
The components of inventory are presented in the tables below.
  
December 31, 2014
(in millions)  
Duke
Energy

 
Duke
Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke
 Energy 
 Ohio 

 
Duke
 Energy 
 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


  
December 31, 2013
(in millions)  
Duke
Energy

 
Duke
Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke
 Energy 
 Ohio 

 
Duke
 Energy 
 Indiana 

Materials and supplies  
$
1,901

 
$
654

 
$
854

 
$
567

 
$
287

 
$
117

 
$
193

Coal held for electric generation  
1,018

 
374

 
334

 
187

 
147

 
65

 
238

Oil, gas and other fuel held for electric generation  
331

 
37

 
236

 
99

 
137

 
47

 
3

Total inventory  
$
3,250

 
$
1,065

 
$
1,424

 
$
853

 
$
571

 
$
229

 
$
434
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,
  
2014

 
2013

 
2012

Duke Energy  
2.8
%
 
2.8
%
 
2.9
%
Duke Energy Carolinas  
2.7
%
 
2.8
%
 
2.8
%
Progress Energy  
2.5
%
 
2.5
%
 
2.6
%
Duke Energy Progress  
2.5
%
 
2.5
%
 
2.7
%
Duke Energy Florida  
2.7
%
 
2.4
%
 
2.5
%
Duke Energy Ohio  
2.3
%
 
3.3
%
 
3.2
%
Duke Energy Indiana  
3.0
%
 
2.8
%
 
3.3
%
The following tables summarize the property, plant and equipment.
 
December 31, 2014
(in millions)
Estimated Useful Life (Years)
 
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy 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.
 
December 31, 2013
(in millions)
Estimated Useful Life (Years)
 
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy Indiana

Land  
 
 
$
1,481

 
$
397

 
$
705

 
$
383

 
$
321

 
$
137

 
$
105

Plant - Regulated  
 
 
  

 
  

 
  

 
  

 
  

 
  

 
  

Electric generation, distribution and transmission  
2 - 125
 
78,272

 
30,018

 
31,792

 
19,190

 
12,601

 
3,925

 
11,594

Natural gas transmission and distribution  
12 - 67
 
2,138

 
—

 
—

 
—

 
—

 
2,138

 
—

Other buildings and improvements  
2 - 100
 
1,397

 
447

 
610

 
282

 
315

 
190

 
159

Plant - Nonregulated  
  
 
  

 
  

 
  

 
  

 
  

 
  

 
  

Electric generation, distribution and transmission  
2 - 100
 
6,267

 
—

 
—

 
—

 
—

 
4,017

 
—

Other buildings and improvements  
9 -100
 
2,512

 
—

 
—

 
—

 
—

 
5

 
—

Nuclear fuel  
  
 
2,458

 
1,446

 
1,012

 
1,012

 
—

 
—

 
—

Equipment  
1 - 33
 
1,557

 
287

 
621

 
357

 
94

 
317

 
146

Construction in process  
  
 
3,595

 
1,741

 
873

 
631

 
238

 
166

 
307

Other  
5 - 33
 
3,438

 
570

 
867

 
418

 
294

 
248

 
178

Total property, plant and equipment(a)(d)
 
 
103,115

 
34,906

 
36,480

 
22,273

 
13,863

 
11,143

 
12,489

Total accumulated depreciation - regulated(b)(c)(d)
 
 
(31,659
)
 
(11,894
)
 
(13,098
)
 
(8,623
)
 
(4,252
)
 
(2,160
)
 
(3,913
)
Total accumulated depreciation - nonregulated(c)(d)
 
 
(1,966
)
 
—

 
—

 
—

 
—

 
(748
)
 
—

Total net property, plant and equipment  
 
 
$
69,490

 
$
23,012

 
$
23,382

 
$
13,650

 
$
9,611

 
$
8,235

 
$
8,576

(a)
Includes capitalized leases of $1,606 million, $53 million, $328 million, $148 million, $180 million, $96 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 $60 million, an insignificant amount and $57 million, respectively, of accumulated amortization of capitalized leases.
(b)
Includes $1,118 million, $681 million, $438 million and $438 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 $40 million, $4 million, $21 million and $5 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 $1,678 million and accumulated depreciation of consolidated VIEs of $175 million at Duke Energy.
Schedule of Allowance for Doubtful Accounts
Allowances for doubtful accounts are presented in the following table.
  
December 31,
(in millions)  
2014

 
2013

 
2012

Allowance for Doubtful Accounts  
  
 
  
 
  
Duke Energy  
$
17

 
30

 
34

Duke Energy Carolinas  
3

 
3

 
3

Progress Energy  
8

 
14

 
16

Duke Energy Progress  
7

 
10

 
9

Duke Energy Florida  
2

 
4

 
7

Duke Energy Ohio  
2

 
2

 
2

Duke Energy Indiana  
1

 
1

 
1

Allowance for Doubtful Accounts - VIEs  
  
 
  
 
  
Duke Energy  
$
51

 
43

 
44

Duke Energy Carolinas  
6

 
6

 
6

Progress Energy  
8

 
—

 
—

Duke Energy Progress  
5

 
—

 
—

Duke Energy Florida  
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)  
2014

 
2013

 
2012

Duke Energy  
$
498

 
$
602

 
$
466

Duke Energy Carolinas  
94

 
164

 
161

Progress Energy  
263

 
304

 
317

Duke Energy Progress  
56

 
115

 
113

Duke Energy Florida  
207

 
189

 
205

Duke Energy Ohio  
103

 
105

 
102

Duke Energy Indiana  
38

 
29

 
33
Unbilled Revenues [Member]  
Organization And Basis Of Presentation [Line Items]  
Schedule Of Unbilled Revenues With 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).
  
December 31,
(in millions)  
2014

 
2013

Duke Energy  
$
827

 
$
937

Duke Energy Carolinas  
295

 
323

Progress Energy  
217

 
189

Duke Energy Progress  
135

 
120

Duke Energy Florida  
82

 
69

Duke Energy Ohio  
—

 
55

Duke Energy Indiana  
27

 
5


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)
2014

 
2013

Duke Energy Ohio
79

 
89

Duke Energy Indiana
112

 
144