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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2020
Retirement Benefits [Abstract]  
Employee Benefit Plans EMPLOYEE BENEFIT PLANS
DEFINED BENEFIT RETIREMENT PLANS
Duke Energy and certain subsidiaries maintain, and the Subsidiary Registrants participate in, qualified and non-qualified, non-contributory defined benefit retirement plans. Duke Energy's policy is to fund amounts on an actuarial basis to provide assets sufficient to meet benefit payments to be paid to plan participants.
QUALIFIED PENSION PLANS
The following tables include the components of net periodic pension costs for qualified pension plans.
 
Three Months Ended June 30, 2020
 
 
 
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

 
$
14

 
$
12

 
$
8

 
$
6

 
$
1

 
$
2

 
$
2

Interest cost on projected benefit obligation
68

 
15

 
22

 
9

 
11

 
4

 
5

 
3

Expected return on plan assets
(143
)
 
(36
)
 
(47
)
 
(22
)
 
(26
)
 
(7
)
 
(10
)
 
(6
)
Amortization of actuarial loss
30

 
7

 
9

 
4

 
5

 
1

 
3

 
3

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

 
(1
)
 
(3
)
Amortization of settlement charges
3

 
1

 
—

 
1

 
—

 
—

 
—

 
—

Net periodic pension costs
$
(8
)
 
$
(1
)
 
$
(5
)
 
$
(1
)
 
$
(5
)
 
$
(1
)
 
$
(1
)
 
$
(1
)
 
Three Months Ended June 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
$
37

 
$
12

 
$
10

 
$
6

 
$
6

 
$
1

 
$
2

 
$
2

Interest cost on projected benefit obligation
82

 
21

 
26

 
12

 
13

 
4

 
7

 
3

Expected return on plan assets
(143
)
 
(37
)
 
(45
)
 
(21
)
 
(22
)
 
(6
)
 
(10
)
 
(6
)
Amortization of actuarial loss
25

 
5

 
9

 
3

 
6

 
—

 
1

 
1

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

 
(1
)
 
(1
)
 
—

 
(1
)
 
(2
)
Net periodic pension costs
$
(7
)
 
$
(1
)
 
$
—

 
$
(1
)
 
$
2

 
$
(1
)
 
$
(1
)
 
$
(2
)

 
Six Months Ended June 30, 2020
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
 
 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

 
 
(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

 
Piedmont

Service cost
$
83

 
$
26

 
$
24

 
$
14

 
$
11

 
$
2

 
$
4

 
$
3

Interest cost on projected benefit obligation
135

 
31

 
43

 
19

 
23

 
8

 
11

 
5

Expected return on plan assets
(286
)
 
(72
)
 
(95
)
 
(44
)
 
(51
)
 
(14
)
 
(21
)
 
(11
)
Amortization of actuarial loss
64

 
14

 
20

 
9

 
11

 
3

 
6

 
5

Amortization of prior service credit
(16
)
 
(4
)
 
(2
)
 
(1
)
 
(1
)
 
—

 
(1
)
 
(5
)
Amortization of settlement charges
5

 
2

 
1

 
1

 
—

 
—

 
—

 
—

Net periodic pension costs
$
(15
)
 
$
(3
)
 
$
(9
)
 
$
(2
)
 
$
(7
)
 
$
(1
)
 
$
(1
)
 
$
(3
)
 
Six Months Ended June 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
$
74

 
$
24

 
$
21

 
$
12

 
$
10

 
$
2

 
$
4

 
$
3

Interest cost on projected benefit obligation
165

 
41

 
52

 
24

 
27

 
9

 
13

 
6

Expected return on plan assets
(286
)
 
(75
)
 
(89
)
 
(44
)
 
(44
)
 
(14
)
 
(21
)
 
(11
)
Amortization of actuarial loss
49

 
11

 
18

 
6

 
12

 
1

 
3

 
3

Amortization of prior service credit
(16
)
 
(4
)
 
(1
)
 
(1
)
 
(1
)
 
—

 
(1
)
 
(5
)
Net periodic pension costs
$
(14
)
 
$
(3
)
 
$
1

 
$
(3
)
 
$
4

 
$
(2
)
 
$
(2
)
 
$
(4
)

NON-QUALIFIED PENSION PLANS
Net periodic pension costs for non-qualified pension plans were not material for the three and six months ended June 30, 2020, and 2019.
OTHER POST-RETIREMENT BENEFIT PLANS
Net periodic costs for OPEB plans were not material for the three and six months ended June 30, 2020, and 2019.