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Commitments and Contingencies (Table)
12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Additional Possible Losses in Excess of Recorded Environmental Reserves
Additional losses in excess of recorded reserves that could be incurred for the stages of investigation, remediation and monitoring for environmental sites that have been evaluated at this time are not material except as presented in the table below.
(in millions)
 
Duke Energy
$
56

Duke Energy Carolinas
19

Duke Energy Ohio
30

Piedmont
2

Schedule of Legal Reserves
The table below presents recorded reserves based on management’s best estimate of probable loss for legal matters, excluding asbestos-related reserves and the exit obligation discussed above related to the termination of an EPC contract. Reserves are classified on the Consolidated Balance Sheets in Other within Other Noncurrent Liabilities and Accounts payable and Other within Current Liabilities. The reasonably possible range of loss in excess of recorded reserves is not material, other than as described above.
 
December 31,
(in millions)  
2017

 
2016

Reserves for Legal Matters
 
 
 
Duke Energy
$
88

 
$
98

Duke Energy Carolinas
30

 
23

Progress Energy
55

 
59

Duke Energy Progress
13

 
14

Duke Energy Florida
24

 
28

Duke Energy Ohio

 
4

Piedmont
2

 
2

Schedule of Purchase Power Obligations
The following table presents executory purchased power contracts with terms exceeding one year, excluding contracts classified as leases. Amounts at Duke Energy Ohio were immaterial.
 
 
 
Minimum Purchase Amount at December 31, 2017
 
Contract
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(in millions)
Expiration
 
2018

 
2019

 
2020

 
2021

 
2022

 
Thereafter

 
Total

Duke Energy Progress(a)
2019-2031
 
$
68

 
$
68

 
$
51

 
$
52

 
$
30

 
$
239

 
$
508

Duke Energy Florida(b)
2021-2043
 
357

 
374

 
394

 
378

 
376

 
770

 
2,649

(a)    Contracts represent between 15 percent and 100 percent of net plant output.
(b)     Contracts represent between 81 percent and 100 percent of net plant output.
Schedule of Natural Gas Supply Contract Commitments [Table Text Block]
The following table presents future unconditional purchase obligations under natural gas supply and capacity contracts as of December 31, 2017.
(in millions)
Duke Energy
Duke Energy Ohio
Piedmont
2018
$
314

$
37

$
277

2019
280

28

252

2020
252

25

227

2021
249

26

223

2022
226

11

215

Thereafter
1,121

3

1,118

Total
$
2,442

$
130

$
2,312

Schedule of Operating Lease Rent Expense
The following tables present rental expense for operating leases. These amounts are included in Operation, maintenance and other on the Consolidated Statements of Operations.
 
Years Ended December 31,
(in millions)
2017

 
2016

 
2015

Duke Energy
$
241

 
$
242

 
$
313

Duke Energy Carolinas
44

 
45

 
41

Progress Energy
130

 
140

 
230

Duke Energy Progress
75

 
68

 
149

Duke Energy Florida
55

 
72

 
81

Duke Energy Ohio
15

 
16

 
13

Duke Energy Indiana
23

 
23

 
20

 
Year Ended
 
Two Months Ended
 
Years Ended October 31,
(in millions)
December 31, 2017
 
December 31, 2016
 
2016

 
2015

Piedmont
$
7

 
$
1

 
$
5

 
$
5

Schedule of Future Minimum Rental Payments for Operating Leases
The following table presents future minimum lease payments under operating leases, which at inception had a non-cancelable term of more than one year.
 
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

2018
$
233

 
$
36

 
$
133

 
$
77

 
$
56

 
$
20

 
$
22

$
6

2019
203

 
29

 
126

 
72

 
54

 
12

 
14

5

2020
183

 
25

 
117

 
62

 
55

 
10

 
10

5

2021
150

 
19

 
97

 
48

 
49

 
7

 
8

6

2022
135

 
16

 
90

 
42

 
48

 
4

 
5

6

Thereafter
882

 
52

 
525

 
344

 
181

 
5

 
7

16

Total
$
1,786

 
$
177

 
$
1,088

 
$
645

 
$
443

 
$
58

 
$
66

$
44

Schedule of Future Minimum Lease Payments for Capital Leases
The following table presents future minimum lease payments under capital leases.
 
December 31, 2017
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

2018
$
168

 
$
13

 
$
46

 
$
21

 
$
25

 
$
3

 
$
2

2019
169

 
13

 
45

 
20

 
25

 
1

 
1

2020
174

 
13

 
47

 
21

 
26

 

 
1

2021
176

 
8

 
45

 
22

 
25

 

 
1

2022
169

 
8

 
45

 
21

 
24

 

 
1

Thereafter
745

 
109

 
323

 
227

 
95

 

 
38

Minimum annual payments
1,601

 
164

 
551

 
332

 
220

 
4

 
44

Less: amount representing interest
(601
)
 
(103
)
 
(283
)
 
(192
)
 
(91
)
 

 
(33
)
Total
$
1,000

 
$
61

 
$
268

 
$
140

 
$
129

 
$
4

 
$
11

Reserve for Environmental Costs [Member]  
Valuation and Qualifying Accounts Disclosure [Line Items]  
Schedule of Legal Reserves
The following tables contain information regarding reserves for probable and estimable costs related to the various environmental sites. These reserves are recorded in Accounts payable within Current Liabilities and Other within Other Noncurrent Liabilities on the Consolidated Balance Sheets.
 
 
 
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
$
92

 
$
10

 
$
17

 
$
5

 
$
12

 
$
54

 
$
10

Provisions/adjustments
11

 
1

 
4

 

 
4

 
1

 
5

Cash reductions
(9
)
 
(1
)
 
(4
)
 
(2
)
 
(2
)
 
(1
)
 
(3
)
Balance at December 31, 2015
94

 
10

 
17

 
3

 
14

 
54

 
12

Provisions/adjustments
19

 
4

 
7

 
2

 
4

 
7

 
1

Cash reductions
(15
)
 
(4
)
 
(6
)
 
(2
)
 
(4
)
 
(2
)
 
(3
)
Balance at December 31, 2016
98

 
10

 
18

 
3

 
14

 
59

 
10

Provisions/adjustments
8

 
3

 
3

 
2

 
2

 
3

 
(4
)
Cash reductions
(25
)
 
(3
)
 
(6
)
 
(2
)
 
(4
)
 
(15
)
 
(1
)
Balance at December 31, 2017
$
81

 
$
10

 
$
15

 
$
3

 
$
12

 
$
47

 
$
5


As of December 31, 2016, October 31, 2016, 2015 and 2014, Piedmont's environmental reserve was $1 million. In 2017, a $1 million provision was recorded, resulting in a reserve balance of $2 million at December 31, 2017.