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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2015
Defined Benefit Plan Disclosure [Line Items]  
Employee Savings Plan Matching Contributions
The following table includes pretax 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.
(in millions)
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy Indiana

Three Months Ended March 31,
 
 
 
 
 
 
 
 
 
 
2015
$
49

 
$
16

 
$
14

 
$
11

 
$
4

 
$
1

 
$
2

2014
43

 
14

 
12

 
9

 
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.
 
Three Months Ended March 31, 2015
(in millions)
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy Indiana

 
 
 
 
 
 
 
 
 
 
 
Contributions
$
132

 
$
42

 
$
42

 
$
21

 
$
21

 
$
1

 
$
9

Duke Energy did not make any contributions to its U.S. qualified defined benefit pension plans during the three months ended March 31, 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 March 31, 2015
(in millions)
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy 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

 
Three Months Ended March 31, 2014
(in millions)
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy Indiana

Service cost
$
34

 
$
10

 
$
10

 
$
5

 
$
5

 
$
1

 
$
2

Interest cost on projected benefit obligation
86

 
21

 
28

 
13

 
14

 
5

 
7

Expected return on plan assets
(128
)
 
(33
)
 
(43
)
 
(21
)
 
(21
)
 
(7
)
 
(9
)
Amortization of actuarial loss
37

 
9

 
17

 
8

 
8

 
1

 
3

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

 
—

 
—

 
—

Other
2

 
1

 
1

 
—

 
—

 
—

 
—

Net periodic pension costs
$
27

 
$
6

 
$
12

 
$
5

 
$
6

 
$
—

 
$
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, 2015
(in millions)
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy 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
)
 
$
—

 
$
—

 
Three Months Ended March 31, 2014
(in millions)
Duke Energy

 
Duke Energy Carolinas

 
Progress Energy

 
Duke Energy Progress

 
Duke Energy Florida

 
Duke Energy Ohio

 
Duke Energy Indiana

Service cost
$
2

 
$
—

 
$
1

 
$
—

 
$
1

 
$
—

 
$
—

Interest cost on accumulated post-retirement benefit obligation
12

 
3

 
6

 
3

 
3

 
—

 
1

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

 
—

 
—

 
—

 
—

Amortization of actuarial loss
10

 
1

 
10

 
7

 
2

 
—

 
—

Amortization of prior service credit
(31
)
 
(3
)
 
(24
)
 
(18
)
 
(5
)
 
—

 
—

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

 
$
—

 
$
1