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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]  
Defined Contribution Plan Disclosures
The following table includes employer contributions 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

 
Piedmont

Three Months Ended September 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2018
$
49

 
$
15

 
$
13

 
$
9

 
$
4

 
$

 
$
3

 
$
4

2017
43

 
14

 
12

 
9

 
4

 
1

 
2

 
2

Nine Months Ended September 30,
 
 
 
 
 
 
 
 
 
 
 
 
2018
$
167

 
$
53

 
$
45

 
$
31

 
$
14

 
$
2

 
$
8

 
$
10

2017
147

 
49

 
42

 
30

 
13

 
3

 
7

 
5

Qualified Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Defined Benefit Plans Disclosures
The following table presents contributions made by the Duke Energy Registrants to their qualified defined benefit pension plans during the nine months ended September 30, 2018.
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Indiana

Contributions
$
141

 
$
46

 
$
45

 
$
25

 
$
20

 
$
8

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, 2018
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
47

 
$
15

 
$
13

 
$
7

 
$
5

 
$
2

 
$
2

 
$
2

Interest cost on projected benefit obligation
74

 
18

 
24

 
10

 
13

 
4

 
6

 
3

Expected return on plan assets
(140
)
 
(37
)
 
(45
)
 
(21
)
 
(23
)
 
(7
)
 
(10
)
 
(6
)
Amortization of actuarial loss
33

 
7

 
11

 
6

 
6

 
1

 
2

 
3

Amortization of prior service credit
(8
)
 
(2
)
 
(1
)
 

 

 

 

 
(3
)
Net periodic pension costs
$
6

 
$
1

 
$
2

 
$
2

 
$
1

 
$

 
$

 
$
(1
)
 
Three Months Ended September 30, 2017
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
40

 
$
12

 
$
12

 
$
6

 
$
5

 
$
1

 
$
2

 
$
3

Interest cost on projected benefit obligation
82

 
20

 
25

 
12

 
13

 
4

 
7

 
3

Expected return on plan assets
(136
)
 
(35
)
 
(43
)
 
(21
)
 
(21
)
 
(7
)
 
(11
)
 
(6
)
Amortization of actuarial loss
36

 
8

 
14

 
6

 
7

 
1

 
3

 
3

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

 

 

 

 
(1
)
Other
2

 

 
1

 

 

 

 

 

Net periodic pension costs
$
18

 
$
3

 
$
8

 
$
3

 
$
4

 
$
(1
)
 
$
1

 
$
2

 
Nine Months Ended September 30, 2018
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke
 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy
 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
137

 
$
45

 
$
39

 
$
22

 
$
16

 
$
4

 
$
7

 
$
6

Interest cost on projected benefit obligation
224

 
54

 
70

 
31

 
38

 
13

 
18

 
9

Expected return on plan assets
(420
)
 
(111
)
 
(133
)
 
(63
)
 
(69
)
 
(21
)
 
(31
)
 
(18
)
Amortization of actuarial loss
99

 
21

 
33

 
16

 
18

 
3

 
6

 
9

Amortization of prior service credit
(24
)
 
(6
)
 
(3
)
 
(1
)
 
(1
)
 

 

 
(9
)
Net periodic pension costs
$
16

 
$
3

 
$
6

 
$
5

 
$
2

 
$
(1
)
 
$

 
$
(3
)
 
Nine Months Ended September 30, 2017
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
120

 
$
36

 
$
36

 
$
18

 
$
15

 
$
3

 
$
6

 
$
9

Interest cost on projected benefit obligation
246

 
60

 
75

 
36

 
39

 
14

 
21

 
9

Expected return on plan assets
(408
)
 
(106
)
 
(129
)
 
(63
)
 
(63
)
 
(21
)
 
(33
)
 
(18
)
Amortization of actuarial loss
108

 
24

 
42

 
18

 
21

 
3

 
9

 
9

Amortization of prior service credit
(18
)
 
(6
)
 
(3
)
 

 

 

 

 
(3
)
Other
6

 

 
3

 
1

 

 

 

 
1

Net periodic pension costs
$
54

 
$
8

 
$
24

 
$
10

 
$
12

 
$
(1
)
 
$
3

 
$
7

Non-Qualified 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, 2018
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

Interest cost on projected benefit obligation
$
3

 
$

 
$
1

 
$

 
$

Amortization of actuarial loss
2

 

 

 

 

Net periodic pension costs
$
5

 
$

 
$
1

 
$

 
$

 
Three Months Ended September 30, 2017
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

Interest cost on projected benefit obligation
$
4

 
$

 
$
1

 
$
1

 
$
1

Amortization of actuarial loss
2

 

 
1

 

 

Net periodic pension costs
$
6

 
$

 
$
2

 
$
1

 
$
1

 
Nine Months Ended September 30, 2018
 
 
 
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
9

 

 
3

 
1

 
1

Amortization of actuarial loss
6

 

 

 

 

Amortization of prior service (credit) cost
(1
)
 

 
1

 

 

Net periodic pension costs
$
15

 
$
1

 
$
4

 
$
1

 
$
1

 
Nine Months Ended September 30, 2017
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

Interest cost on projected benefit obligation
$
10

 
$
1

 
$
3

 
$
2

 
$
2

Amortization of actuarial loss
6

 

 
3

 

 

Net periodic pension costs
$
16

 
$
1

 
$
6

 
$
2

 
$
2

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, 2018
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
2

 
$

 
$

 
$

 
$

 
$

 
$

 
$

Interest cost on accumulated post-retirement benefit obligation
7

 
2

 
3

 
2

 
1

 

 
1

 

Expected return on plan assets
(4
)
 
(2
)
 

 

 

 

 

 

Amortization of actuarial loss
2

 
1

 

 

 

 

 
1

 

Amortization of prior service credit
(5
)
 
(1
)
 
(2
)
 

 
(1
)
 

 

 

Net periodic other post-retirement benefit costs
$
2

 
$

 
$
1

 
$
2

 
$

 
$

 
$
2

 
$

 
Three Months Ended September 30, 2017
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

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
2

 

 
5

 
3

 
2

 

 

 

Amortization of prior service credit
(29
)
 
(2
)
 
(21
)
 
(14
)
 
(8
)
 

 

 

Net periodic other post-retirement benefit costs
$
(20
)
 
$
(2
)
 
$
(12
)
 
$
(9
)
 
$
(4
)
 
$

 
$
1

 
$

 
Nine Months Ended September 30, 2018
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
5

 
$
1

 
$

 
$

 
$

 
$

 
$

 
$

Interest cost on accumulated post-retirement benefit obligation
21

 
5

 
9

 
5

 
4

 
1

 
3

 

Expected return on plan assets
(10
)
 
(6
)
 

 

 

 

 

 

Amortization of actuarial loss
5

 
2

 
1

 

 

 

 
3

 

Amortization of prior service credit
(15
)
 
(3
)
 
(6
)
 

 
(4
)
 

 

 
(1
)
Net periodic other post-retirement benefit costs
$
6

 
$
(1
)
 
$
4

 
$
5

 
$

 
$
1

 
$
6

 
$
(1
)
 
Nine Months Ended September 30, 2017
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
3

 
$

 
$

 
$

 
$

 
$

 
$

 
$

Interest cost on accumulated post-retirement benefit obligation
27

 
6

 
11

 
6

 
6

 

 
1

 

Expected return on plan assets
(10
)
 
(6
)
 

 

 

 

 

 

Amortization of actuarial loss (gain)
6

 
(2
)
 
15

 
9

 
6

 
(1
)
 

 

Amortization of prior service credit
(87
)
 
(6
)
 
(63
)
 
(41
)
 
(23
)
 

 

 

Net periodic other post-retirement benefit costs
$
(61
)
 
$
(8
)
 
$
(37
)
 
$
(26
)
 
$
(11
)
 
$
(1
)
 
$
1

 
$