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Employee Benefit Plans (Tables) - Qualified Pension Plan [Member]
 9 Months Ended
Sep. 30, 2019
Defined Benefit Plan Disclosure [Line Items]  
Summary of Defined Benefit Plan Contributions
The following table includes information related to the Duke Energy Registrants' contributions to its qualified defined benefit pension plans.
 
Nine Months Ended September 30, 2019
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Contributions made
$
77

 
$
7

 
$
57

 
$
4

 
$
53

 
$
2

 
$
2

 
$
1
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, 2019
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
42

 
$
13

 
$
13

 
$
7

 
$
5

 
$
1

 
$
2

 
$
1

Interest cost on projected benefit obligation
77

 
17

 
24

 
10

 
14

 
5

 
6

 
2

Expected return on plan assets
(140
)
 
(36
)
 
(45
)
 
(22
)
 
(22
)
 
(7
)
 
(11
)
 
(5
)
Amortization of actuarial loss
28

 
6

 
10

 
4

 
6

 
2

 
3

 
2

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

 
—

 
—

 
—

 
(2
)
Net periodic pension costs
$
(1
)
 
$
(2
)
 
$
1

 
$
(1
)
 
$
3

 
$
1

 
$
—

 
$
(2
)
 
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
)

 
Nine Months Ended September 30, 2019
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
116

 
$
37

 
$
34

 
$
19

 
$
15

 
$
3

 
$
6

 
$
4

Interest cost on projected benefit obligation
242

 
58

 
76

 
34

 
41

 
14

 
19

 
8

Expected return on plan assets
(426
)
 
(111
)
 
(134
)
 
(66
)
 
(66
)
 
(21
)
 
(32
)
 
(16
)
Amortization of actuarial loss
77

 
17

 
28

 
10

 
18

 
3

 
6

 
5

Amortization of prior service credit
(24
)
 
(6
)
 
(2
)
 
(1
)
 
(1
)
 
—

 
(1
)
 
(7
)
Net periodic pension costs
$
(15
)
 
$
(5
)
 
$
2

 
$
(4
)
 
$
7

 
$
(1
)
 
$
(2
)
 
$
(6
)
 
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
)