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Defined Benefits
 6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Defined Benefits
Defined Benefits
 
(PPL, LKE and LG&E)
 
Certain net periodic defined benefit costs are applied to accounts that are further distributed among capital, expense and regulatory assets, including certain costs allocated to applicable subsidiaries for plans sponsored by PPL Services and LKE. Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL and its subsidiaries, LKE and its subsidiaries and LG&E for the periods ended June 30:
 
 
Pension Benefits
 
Three Months
 
Six Months
 
U.S.
 
U.K.
 
U.S.
 
U.K.
 
2016
 
2015
 
2016 (b)
 
2015
 
2016
 
2015
 
2016 (b)
 
2015
PPL
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
16

 
$
26

 
$
18

 
$
19

 
$
33

 
$
56

 
$
36

 
$
39

Interest cost
44

 
52

 
62

 
77

 
87

 
110

 
124

 
156

Expected return on plan assets
(58
)
 
(69
)
 
(132
)
 
(129
)
 
(114
)
 
(145
)
 
(265
)
 
(260
)
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost
3

 
2

 


 
 

 
4

 
4

 


 
 

Actuarial loss
10

 
22

 
36

 
40

 
25

 
47

 
73

 
79

Net periodic defined benefit costs (credits) (a)
$
15

 
$
33

 
$
(16
)
 
$
7

 
$
35

 
$
72

 
$
(32
)
 
$
14

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
LKE
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
6

 
$
6

 
 
 
 
 
$
12

 
$
13

 
 
 
 
Interest cost
18

 
17

 
 
 
 
 
35

 
34

 
 
 
 
Expected return on plan assets
(24
)
 
(22
)
 
 
 
 
 
(45
)
 
(44
)
 
 
 
 
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost
3

 
2

 
 
 
 
 
4

 
4

 
 
 
 
Actuarial loss
5

 
9

 
 
 
 
 
10

 
17

 
 
 
 
Net periodic defined benefit costs
$
8

 
$
12

 
 
 
 
 
$
16

 
$
24

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
LG&E
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
1

 
$
1

 
 
 
 
 
$
1

 
$
1

 
 
 
 
Interest cost
4

 
4

 
 
 
 
 
7

 
7

 
 
 
 
Expected return on plan assets
(5
)
 
(5
)
 
 
 
 
 
(10
)
 
(10
)
 
 
 
 
Amortization of:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Prior service cost
1

 
—

 
 
 
 
 
2

 
1

 
 
 
 
Actuarial loss
1

 
3

 
 
 
 
 
3

 
6

 
 
 
 
Net periodic defined benefit costs
$
2

 
$
3

 
 
 
 
 
$
3

 
$
5

 
 
 
 

(a)
For the three and six months ended June 30, 2015, the total net periodic defined benefit cost includes $7 million and $18 million reflected in discontinued operations related to costs allocated from PPL's plans to PPL Energy Supply prior to the spinoff.
(b)
See Note 2 for a discussion of changes to the discount rate used for the U.K. Pension Plans.

 
Other Postretirement Benefits
 
Three Months
 
Six Months
 
2016
 
2015
 
2016
 
2015
PPL
 
 
 
 
 
 
 
Service cost
$
2

 
$
3

 
$
4

 
$
7

Interest cost
7

 
7

 
13

 
14

Expected return on plan assets
(6
)
 
(7
)
 
(11
)
 
(14
)
Net periodic defined benefit costs
$
3

 
$
3

 
$
6

 
$
7

 
 
 
 
 
 
 
 
LKE
 
 
 
 
 
 
 
Service cost
$
1

 
$
2

 
$
2

 
$
3

Interest cost
3

 
3

 
5

 
5

Expected return on plan assets
(1
)
 
(2
)
 
(3
)
 
(3
)
Amortization of prior service cost
—

 
—

 
1

 
1

Net periodic defined benefit costs
$
3

 
$
3

 
$
5

 
$
6

   
(PPL Electric, LG&E and KU)
 
In addition to the specific plans it sponsors, LG&E is allocated costs of defined benefit plans sponsored by LKE. PPL Electric and KU do not directly sponsor any defined benefit plans. PPL Electric is allocated costs of defined benefit plans sponsored by PPL Services and KU is allocated costs of defined benefit plans sponsored by LKE. These allocations are based on participation in those plans, which management believes are reasonable. For the periods ended June 30, PPL Services allocated the following net periodic defined benefit costs to PPL Electric, and LKE allocated the following net periodic defined benefit costs to LG&E and KU:
 
 
Three Months
 
Six Months
 
2016
 
2015
 
2016
 
2015
PPL Electric
$
5

 
$
8

 
$
11

 
$
16

LG&E
3

 
4

 
5

 
7

KU
3

 
4

 
6

 
9