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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2016
Defined Benefit Plan Disclosure [Line Items]  
Employee Savings Plan Matching Contributions
The following table presents 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

Three Months Ended March 31,
 
 
 
 
 
 
 
 
 
 
2016
$
52

 
$
18

 
$
15

 
$
11

 
$
4

 
$
1

 
$
2

2015
49

 
16

 
14

 
11

 
4

 
1

 
2
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. Duke Energy did not make any contributions to its U.S. qualified defined benefit pension plans during the three months ended March 31, 2016.
 
Three Months Ended March 31, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Contributions
$
132

 
$
42

 
$
42

 
$
21

 
$
21

 
$
1

 
$
9
Components of Net Periodic Pension Costs
The following tables include the components of net periodic pension costs for qualified pension plans.
 
 
 
Three Months Ended March 31, 2016
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
36

 
$
12

 
$
11

 
$
6

 
$
5

 
$
1

 
$
2

Interest cost on projected benefit obligation
83

 
21

 
26

 
12

 
14

 
5

 
7

Expected return on plan assets
(129
)
 
(35
)
 
(42
)
 
(21
)
 
(21
)
 
(7
)
 
(10
)
Amortization of actuarial loss
33

 
8

 
14

 
6

 
7

 
1

 
3

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

 
—

 
—

 
—

Other
3

 
1

 
1

 
—

 
—

 
—

 
—

Net periodic pension costs
$
22

 
$
5

 
$
9

 
$
3

 
$
5

 
$
—

 
$
2

 
Three Months Ended March 31, 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
82

 
21

 
26

 
12

 
14

 
5

 
7

Expected return on plan assets
(129
)
 
(36
)
 
(43
)
 
(20
)
 
(22
)
 
(6
)
 
(10
)
Amortization of actuarial loss
43

 
10

 
17

 
8

 
8

 
2

 
3

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

 
—

 
—

 
—

Other
2

 
1

 
1

 
—

 
—

 
—

 
—

Net periodic pension costs
$
34

 
$
7

 
$
11

 
$
6

 
$
5

 
$
2

 
$
3
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 March 31, 2016
 
 
 
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
8

 
2

 
4

 
2

 
2

 
—

 
1

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

 
—

 
—

 
—

 
—

Amortization of actuarial loss (gain)
1

 
(1
)
 
5

 
3

 
2

 
—

 
(1
)
Amortization of prior service credit
(35
)
 
(3
)
 
(26
)
 
(17
)
 
(9
)
 
—

 
—

Net periodic other post-retirement benefit costs
$
(28
)
 
$
(4
)
 
$
(17
)
 
$
(12
)
 
$
(5
)
 
$
—

 
$
—

 
Three Months Ended March 31, 2015
 
 
 
Duke

 
 
 
Duke

 
Duke

 
Duke

 
Duke

 
Duke

 
Energy

 
Progress

 
Energy

 
Energy

 
Energy

 
Energy

(in millions)
Energy

 
Carolinas

 
Energy

 
Progress

 
Florida

 
Ohio

 
Indiana

Service cost
$
2

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Interest cost on accumulated post-retirement benefit obligation
9

 
2

 
4

 
2

 
2

 
—

 
—

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
$
(21
)
 
$
(4
)
 
$
(15
)
 
$
(10
)
 
$
(4
)
 
$
—

 
$
—