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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Defined Benefit Plan Disclosure [Line Items]  
Employee Savings Plan Matching Contributions
The following table includes employer matching contributions, as well as the additional contribution of 4 percent of eligible pay per pay period for employees not eligible to participate in a defined benefit plan, made by Duke Energy and expensed by the Subsidiary Registrants.
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Three Months Ended September 30,
 
 
 
 
 
 
 
 
 
 
2015
$
34

 
$
11

 
$
10

 
$
7

 
$
3

 
$
—

 
$
1

2014
30

 
10

 
10

 
7

 
3

 
—

 
1

Nine Months Ended September 30,
 
 
 
 
 
 
 
 
 
 
2015
$
120

 
$
40

 
$
36

 
$
26

 
$
10

 
$
2

 
$
5

2014
110

 
36

 
33

 
23

 
10

 
2

 
5
Qualified Pension Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Plan Contributions by Employer
The following table includes information related to the Duke Energy Registrants’ contributions to its U.S. qualified defined benefit pension plans.
 
Nine Months Ended September 30, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
 
 
 
 
 
 
 
 
 
 
Contributions
$
143

 
$
42

 
$
42

 
$
21

 
$
21

 
$
4

 
$
9

Duke Energy and Duke Energy Ohio made contributions of $11 million and $3 million, respectively, to their U.S. qualified defined benefit pension plans during the three months ended September 30, 2015. Duke Energy did not make any contributions to its U.S. qualified defined benefit pension plans during the nine months ended September 30, 2014.
Components of Net Periodic Pension Costs
The following tables include the components of net periodic pension costs for qualified pension plans.
 
Three Months Ended September 30, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
40

 
$
13

 
$
11

 
$
6

 
$
5

 
$
1

 
$
3

Interest cost on projected benefit obligation
81

 
21

 
26

 
12

 
14

 
5

 
7

Expected return on plan assets
(129
)
 
(35
)
 
(43
)
 
(20
)
 
(22
)
 
(7
)
 
(10
)
Amortization of actuarial loss
44

 
10

 
17

 
8

 
8

 
3

 
3

Amortization of prior service credit
(4
)
 
(2
)
 
(1
)
 
—

 
—

 
—

 
—

Other
2

 
1

 
1

 
—

 
—

 
—

 
—

Net periodic pension costs
$
34

 
$
8

 
$
11

 
$
6

 
$
5

 
$
2

 
$
3

 
Three Months Ended September 30, 2014
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
34

 
$
10

 
$
10

 
$
6

 
$
5

 
$
1

 
$
3

Interest cost on projected benefit obligation
86

 
22

 
28

 
13

 
14

 
5

 
7

Expected return on plan assets
(128
)
 
(33
)
 
(44
)
 
(21
)
 
(21
)
 
(7
)
 
(10
)
Amortization of actuarial loss
37

 
8

 
17

 
8

 
8

 
1

 
3

Amortization of prior service credit
(4
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

Other
3

 
1

 
1

 
—

 
—

 
—

 
—

Net periodic pension costs
$
28

 
$
6

 
$
12

 
$
6

 
$
6

 
$
—

 
$
3

 
Nine Months Ended September 30, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
119

 
$
38

 
$
33

 
$
18

 
$
15

 
$
3

 
$
8

Interest cost on projected benefit obligation
244

 
62

 
78

 
36

 
41

 
14

 
21

Expected return on plan assets
(387
)
 
(104
)
 
(127
)
 
(61
)
 
(66
)
 
(20
)
 
(31
)
Amortization of actuarial loss
131

 
30

 
51

 
25

 
24

 
8

 
10

Amortization of prior service credit
(11
)
 
(6
)
 
(3
)
 
(1
)
 
(1
)
 
—

 
—

Other
6

 
2

 
2

 
1

 
1

 
—

 
—

Net periodic pension costs
$
102

 
$
22

 
$
34

 
$
18

 
$
14

 
$
5

 
$
8

 
Nine Months Ended September 30, 2014
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
102

 
$
31

 
$
30

 
$
16

 
$
15

 
$
3

 
$
7

Interest cost on projected benefit obligation
258

 
64

 
84

 
40

 
43

 
15

 
22

Expected return on plan assets
(383
)
 
(99
)
 
(130
)
 
(64
)
 
(64
)
 
(20
)
 
(30
)
Amortization of actuarial loss
111

 
26

 
51

 
24

 
24

 
3

 
9

Amortization of prior service credit
(11
)
 
(6
)
 
(2
)
 
(1
)
 
(1
)
 
—

 
—

Other
6

 
2

 
2

 
1

 
1

 
—

 
—

Net periodic pension costs
$
83

 
$
18

 
$
35

 
$
16

 
$
18

 
$
1

 
$
8
Other Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Pension Costs
The following tables include the components of net periodic pension costs for non-qualified pension plans for registrants with non-qualified pension costs.
 
Three Months Ended September 30, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

Service cost
$
1

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost on projected benefit obligation
3

 
—

 
1

 
—

 
1

Amortization of actuarial loss
2

 
—

 
1

 
—

 
—

Net periodic pension costs
$
6

 
$
—

 
$
2

 
$
—

 
$
1

 
Three Months Ended September 30, 2014
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

Service cost
$
1

 
$
—

 
$
—

 
$
1

 
$
—

Interest cost on projected benefit obligation
3

 
1

 
2

 
—

 
—

Amortization of actuarial loss
1

 
—

 
—

 
—

 
—

Amortization of prior service credit
—

 
—

 
(1
)
 
—

 
—

Net periodic pension costs
$
5

 
$
1

 
$
1

 
$
1

 
$
—

 
Nine Months Ended September 30, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

Service cost
$
2

 
$
—

 
$
1

 
$
—

 
$
—

Interest cost on projected benefit obligation
10

 
1

 
3

 
1

 
2

Amortization of actuarial loss
5

 
—

 
2

 
—

 
1

Net periodic pension costs
$
17

 
$
1

 
$
6

 
$
1

 
$
3

 
Nine Months Ended September 30, 2014
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

Service cost
$
2

 
$
—

 
$
1

 
$
1

 
$
—

Interest cost on projected benefit obligation
10

 
1

 
4

 
1

 
1

Amortization of actuarial loss
2

 
—

 
1

 
—

 
—

Amortization of prior service cost
—

 
—

 
(1
)
 
—

 
—

Net periodic pension costs
$
14

 
$
1

 
$
5

 
$
2

 
$
1
Other Post-Retirement Benefit Plans [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Components of Net Periodic Pension Costs
The following tables include the components of net periodic other post-retirement benefit costs.
 
Three Months Ended September 30, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
1

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost on accumulated post-retirement benefit obligation
9

 
2

 
4

 
2

 
2

 
—

 
1

Expected return on plan assets
(3
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

Amortization of actuarial loss
6

 
—

 
7

 
5

 
3

 
—

 
—

Amortization of prior service credit
(35
)
 
(4
)
 
(26
)
 
(17
)
 
(9
)
 
—

 
—

Net periodic other post-retirement benefit costs
$
(22
)
 
$
(4
)
 
$
(15
)
 
$
(10
)
 
$
(4
)
 
$
—

 
$
1

 
Three Months Ended September 30, 2014
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
2

 
$
—

 
$
1

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost on accumulated post-retirement benefit obligation
13

 
3

 
6

 
3

 
3

 
—

 
1

Expected return on plan assets
(3
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

Amortization of actuarial loss
9

 
1

 
10

 
8

 
3

 
—

 
—

Amortization of prior service credit
(31
)
 
(3
)
 
(24
)
 
(19
)
 
(5
)
 
—

 
—

Net periodic other post-retirement benefit costs
$
(10
)
 
$
(1
)
 
$
(7
)
 
$
(8
)
 
$
1

 
$
—

 
$
1


 
Nine Months Ended September 30, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
4

 
$
1

 
$
1

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost on accumulated post-retirement benefit obligation
27

 
6

 
11

 
6

 
5

 
1

 
3

Expected return on plan assets
(9
)
 
(6
)
 
—

 
—

 
—

 
—

 
—

Amortization of actuarial loss (gain)
19

 
(1
)
 
21

 
14

 
8

 
—

 
(1
)
Amortization of prior service credit
(105
)
 
(11
)
 
(77
)
 
(50
)
 
(25
)
 
—

 
—

Net periodic other post-retirement benefit costs
$
(64
)
 
$
(11
)
 
$
(44
)
 
$
(30
)
 
$
(12
)
 
$
1

 
$
2

 
Nine Months Ended September 30, 2014
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
7

 
$
1

 
$
3

 
$
1

 
$
2

 
$
—

 
$
—

Interest cost on accumulated post-retirement benefit obligation
38

 
9

 
17

 
8

 
9

 
1

 
4

Expected return on plan assets
(9
)
 
(6
)
 
—

 
—

 
—

 
—

 
(1
)
Amortization of actuarial loss (gain)
29

 
2

 
31

 
23

 
8

 
(1
)
 
—

Amortization of prior service credit
(94
)
 
(8
)
 
(71
)
 
(55
)
 
(16
)
 
—

 
—

Net periodic other post-retirement benefit costs
$
(29
)
 
$
(2
)
 
$
(20
)
 
$
(23
)
 
$
3

 
$
—

 
$
3