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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Organization And Basis Of Presentation [Line Items]  
Schedule of Credit Losses for Financing Receivables, Current [Table Text Block]
Allowances for doubtful accounts are presented in the following table.
 
December 31,
(in millions)
2017

 
2016

 
2015

Allowance for Doubtful Accounts
 
 
 
 
 
Duke Energy
$
14

 
$
14

 
$
12

Duke Energy Carolinas
2

 
2

 
3

Progress Energy
4

 
6

 
6

Duke Energy Progress
1

 
4

 
4

Duke Energy Florida
3

 
2

 
2

Duke Energy Ohio
3

 
2

 
2

Duke Energy Indiana
2

 
1

 
1

Piedmont(a)
2

 
3

 
 
Allowance for Doubtful Accounts – VIEs  
 
 
 
 
 
Duke Energy
$
54

 
$
54

 
$
53

Duke Energy Carolinas
7

 
7

 
7

Progress Energy
7

 
7

 
8

Duke Energy Progress
5

 
5

 
5

Duke Energy Florida
2

 
2

 
3


(a)    Piedmont's allowance for doubtful accounts was $2 million as of October 31, 2016, and 2015.
Schedule of Current and Noncurrent Assets and Liabilities
The following table provides a description of amounts included in Other within Current Assets or Current Liabilities that exceed 5 percent of total Current Assets or Current Liabilities on the Duke Energy Registrants' Consolidated Balance Sheets at either December 31, 2017, or 2016.
 
 
 
December 31,
(in millions)
Location
 
2017

 
2016

Duke Energy
 
 
 
 
 
Accrued compensation
Current Liabilities
 
$
757

 
$
765

Duke Energy Carolinas
 
 
 
 
 
Accrued compensation
Current Liabilities
 
$
252

 
$
248

Customer deposits
Current Liabilities
 
121

 
155

Progress Energy
 
 
 

 
 

Income taxes receivable
Current Assets
 
$
278

 
$
19

Customer deposits
Current Liabilities
 
338

 
363

Duke Energy Progress
 
 
 

 
 

Customer deposits
Current Liabilities
 
$
129

 
$
141

Accrued compensation
Current Liabilities
 
132

 
135

Duke Energy Florida
 
 
 

 
 

Customer deposits
Current Liabilities
 
$
208

 
$
222

Duke Energy Ohio
 
 
 

 
 

Income taxes receivable
Current Assets
 
$
36

 
$
16

Customer deposits
Current Liabilities
 
46

 
62

Duke Energy Indiana
 
 
 

 
 

Customer deposits
Current Liabilities
 
$
45

 
$
44

Piedmont
 
 
 
 
 
Income taxes receivable
Current Assets
 
$
43

 
$
9
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, 2016, and 2015.
 
Year ended December 31,
(in millions)
2016
2015
Income from Continuing Operations
$
2,578

$
2,654

Income from Continuing Operations Attributable to Noncontrolling Interests
7

9

Income from Continuing Operations Attributable to Duke Energy Corporation
$
2,571

$
2,645

(Loss) Income From Discontinued Operations, net of tax
$
(408
)
$
177

Income from Discontinued Operations Attributable to Noncontrolling Interests, net of tax
11

6

(Loss) Income From Discontinued Operations Attributable to Duke Energy Corporation, net of tax
$
(419
)
$
171

Net Income
$
2,170

$
2,831

Net Income Attributable to Noncontrolling Interests
18

15

Net Income Attributable to Duke Energy Corporation
$
2,152

$
2,816
Components Of Inventory
The components of inventory are presented in the tables below.
 
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

Materials and supplies
$
2,293

 
$
744

 
$
1,118

 
$
774

 
$
343

 
$
82

 
$
309

 
$
2

Coal
603

 
192

 
255

 
139

 
116

 
17

 
139

 
—

Natural gas, oil and other
354

 
35

 
219

 
104

 
115

 
34

 
2

 
64

Total inventory
$
3,250

 
$
971

 
$
1,592

 
$
1,017

 
$
574

 
$
133

 
$
450

 
$
66

 
December 31, 2016
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Materials and supplies
$
2,374

 
$
767

 
$
1,167

 
$
813

 
$
354

 
$
84

 
$
312

 
$
1

Coal
774

 
251

 
314

 
148

 
166

 
19

 
190

 
—

Natural gas, oil and other
374

 
37

 
236

 
115

 
121

 
34

 
2

 
65

Total inventory
$
3,522

 
$
1,055

 
$
1,717

 
$
1,076

 
$
641

 
$
137

 
$
504

 
$
66
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,
 
2017

 
2016

 
2015

Duke Energy
2.8
%
 
2.8
%
 
2.9
%
Duke Energy Carolinas
2.8
%
 
2.8
%
 
2.8
%
Progress Energy
2.6
%
 
2.7
%
 
2.6
%
Duke Energy Progress
2.6
%
 
2.6
%
 
2.6
%
Duke Energy Florida
2.8
%
 
2.8
%
 
2.7
%
Duke Energy Ohio
2.8
%
 
2.6
%
 
2.7
%
Duke Energy Indiana
3.0
%
 
3.1
%
 
3.0
%
Piedmont(a)
2.3
%
 
 
 
 

(a)
Piedmont's weighted average depreciation rate was 2.4 percent, 2.4 percent, and 2.5 percent for the annualized two months ended December 31, 2016 and for the years ended October 31, 2016 and 2015, respectively.
The following tables summarize the property, plant and equipment for Duke Energy and its subsidiary registrants.
 
December 31, 2017
 
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

 
Piedmont
Land
 
 
$
1,559

 
$
467

 
$
767

 
$
424

 
$
343

 
$
134

 
$
111

 
$
41

Plant – Regulated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Electric generation, distribution and transmission
8-100
 
93,687

 
35,657

 
39,419

 
24,502

 
14,917

 
4,870

 
13,741

 
—

Natural gas transmission and distribution
12-80
 
8,292

 
—

 
—

 
—

 
—

 
2,559

 
—

 
5,733

Other buildings and improvements
15-100
 
1,936

 
647

 
652

 
316

 
336

 
243

 
240

 
154

Plant – Nonregulated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Electric generation, distribution and transmission(a)
5-30
 
4,273

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other buildings and improvements
25-35
 
465

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Nuclear fuel
 
 
3,680

 
2,120

 
1,560

 
1,560

 
—

 
—

 
—

 
—

Equipment
3-55
 
2,122

 
402

 
555

 
416

 
139

 
348

 
169

 
266

Construction in process
 
 
6,995

 
2,614

 
3,059

 
1,434

 
1,625

 
350

 
416

 
231

Other
3-40
 
4,498

 
1,032

 
1,311

 
931

 
370

 
228

 
271

 
300

Total property, plant and equipment(b)(e)
 
 
127,507

 
42,939

 
47,323

 
29,583

 
17,730

 
8,732

 
14,948

 
6,725

Total accumulated depreciation – regulated(c)(d)(e)
 
 
(39,742
)
 
(15,063
)
 
(15,857
)
 
(10,903
)
 
(4,947
)
 
(2,691
)
 
(4,662
)
 
(1,479
)
Total accumulated depreciation – nonregulated(d)(e)
 
 
(1,795
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Generation facilities to be retired, net
 
 
421

 
—

 
421

 
421

 
—

 
—

 
—

 
—

Total net property, plant and equipment
 
 
$
86,391


$
27,876


$
31,887


$
19,101


$
12,783


$
6,041

 
$
10,286

 
$
5,246

(a)
Includes a pretax impairment charge of $58 million on a wholly owned non-contracted wind project. See discussion below.
(b)
Includes capitalized leases of $1,294 million, $81 million, $272 million, $139 million, $133 million, $80 million and $35 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 $114 million, $11 million and $103 million, respectively, of accumulated amortization of capitalized leases.
(c)
Includes $2,113 million, $1,283 million, $831 million and $831 million of accumulated amortization of nuclear fuel at Duke Energy, Duke Energy Carolinas, Progress Energy and Duke Energy Progress, respectively.
(d)
Includes accumulated amortization of capitalized leases of $57 million, $11 million, $21 million and $9 million at Duke Energy, Duke Energy Carolinas, Duke Energy Ohio and Duke Energy Indiana, respectively.
(e)
Includes gross property, plant and equipment cost of consolidated VIEs of $3,941 million and accumulated depreciation of consolidated VIEs of $598 million at Duke Energy.
 
December 31, 2016
 
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

 
Piedmont
Land
 
 
$
1,501

 
$
432

 
$
735

 
$
393

 
$
342

 
$
150

 
$
106

 
$
39

Plant – Regulated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Electric generation, distribution and transmission
8-100
 
89,864

 
34,515

 
37,596

 
23,683

 
13,913

 
4,593

 
13,160

 
—

Natural gas transmission and distribution
12-67
 
7,738

 
—

 
—

 
—

 
—

 
2,456

 
—

 
5,282

Other buildings and improvements
15-100
 
1,692

 
502

 
634

 
293

 
341

 
211

 
197

 
148

Plant – Nonregulated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Electric generation, distribution and transmission
5-30
 
4,298

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other buildings and improvements
25-35
 
421

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Nuclear fuel
 
 
3,572

 
2,092

 
1,480

 
1,480

 
—

 
—

 
—

 
—

Equipment
3-38
 
1,941

 
358

 
505

 
378

 
127

 
338

 
156

 
260

Construction in process
 
 
6,186

 
2,324

 
2,708

 
1,329

 
1,379

 
206

 
396

 
210

Other
5-40
 
4,184

 
904

 
1,206

 
863

 
332

 
172

 
226

 
235

Total property, plant and equipment(a)(d)
 
 
121,397

 
41,127

 
44,864

 
28,419

 
16,434

 
8,126

 
14,241

 
6,174

Total accumulated depreciation – regulated(b)(c)(d)
 
 
(37,831
)
 
(14,365
)
 
(15,212
)
 
(10,561
)
 
(4,644
)
 
(2,579
)
 
(4,317
)
 
(1,360
)
Total accumulated depreciation – nonregulated(c)(d)
 
 
(1,575
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Generation facilities to be retired, net
 
 
529

 
—

 
529

 
529

 
—

 
—

 
—

 
—

Total net property, plant and equipment
 
 
$
82,520

 
$
26,762

 
$
30,181

 
$
18,387

 
$
11,790

 
$
5,547

 
$
9,924

 
$
4,814

(a)
Includes capitalized leases of $1,355 million, $40 million, $288 million, $142 million, $146 million, $81 million and $35 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 $99 million, $9 million and $90 million, respectively, of accumulated amortization of capitalized leases.
(b)
Includes $1,922 million, $1,192 million, $730 million and $730 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 $50 million, $9 million, $19 million and $8 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 $2,591 million and accumulated depreciation of consolidated VIEs of $411 million at Duke Energy.
Schedule of Excise Taxes
Excise taxes accounted for on a gross basis within both Operating Revenues and Property and other taxes in the Consolidated Statements of Operations were as follows.
 
Years Ended December 31,
(in millions)
2017

 
2016

 
2015

Duke Energy
$
376

 
$
362

 
$
396

Duke Energy Carolinas
36

 
31

 
31

Progress Energy
220

 
213

 
229

Duke Energy Progress
19

 
18

 
16

Duke Energy Florida
201

 
195

 
213

Duke Energy Ohio
98

 
100

 
102

Duke Energy Indiana
20

 
17

 
34

Piedmont(a)
2

 
 
 
 

(a)
Piedmont's excise taxes were immaterial for the two months ended December 31, 2016, and $2 million for the years ended October 31, 2016, and 2015.
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 Receivables of VIEs on the Consolidated Balance Sheets as shown in the following table.
 
December 31,
(in millions)
2017

 
2016

Duke Energy
$
944

 
$
831

Duke Energy Carolinas
342

 
313

Progress Energy
228

 
161

Duke Energy Progress
143

 
102

Duke Energy Florida
85

 
59

Duke Energy Ohio
4

 
2

Duke Energy Indiana
21

 
32

Piedmont
86

 
77


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)
2017

 
2016

Duke Energy Ohio
$
104

 
$
97

Duke Energy Indiana
132

 
123