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Defined Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule Of Net Periodic Defined Benefit Costs (Credits)
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 March 31:
 
Pension Benefits
 
Three Months
 
U.S.
 
U.K.
 
2018
 
2017
 
2018
 
2017
PPL
 
 
 
 
 
 
 
Service cost
$
16

 
$
17

 
$
21

 
$
19

Interest cost
39

 
42

 
47

 
43

Expected return on plan assets
(62
)
 
(57
)
 
(150
)
 
(125
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
2

 
2

 
—

 
—

Actuarial loss
22

 
20

 
39

 
35

Net periodic defined benefit costs (credits) before settlements and special termination benefits
17

 
24

 
(43
)
 
(28
)
Special termination benefits (a)
—

 
2

 
—

 
—

Net periodic defined benefit costs (credits)
$
17

 
$
26

 
$
(43
)
 
$
(28
)

(a)
Enhanced pension benefits offered to certain PPL Electric bargaining unit employees under a one-time voluntary retirement window offered as part of the new five year IBEW contract ratified in March 2017.
 
Pension Benefits
 
Three Months
 
2018
 
2017
LKE
 
 
 
Service cost
$
7

 
$
7

Interest cost
16

 
16

Expected return on plan assets
(26
)
 
(22
)
Amortization of:
 
 
 
Prior service cost
2

 
2

Actuarial loss (a)
10

 
11

Net periodic defined benefit costs
$
9

 
$
14



(a)
As a result of treatment approved by the KPSC, the difference between actuarial loss calculated in accordance with LKE's accounting policy and actuarial loss calculated using a 15-year amortization period was $4 million and $5 million for the three months ended March 31, 2018 and 2017. This difference is recorded as a regulatory asset.
 
Pension Benefits
 
Three Months
 
2018
 
2017
LG&E
 
 
 
Interest cost
$
3

 
$
3

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

 
1

Actuarial loss (a)
2

 
3

Net periodic defined benefit costs
$
1

 
$
2


(a)
As a result of treatment approved by the KPSC, the difference between actuarial loss calculated in accordance with LG&E's accounting policy and actuarial loss calculated using a 15-year amortization period was $1 million for the three months ended March 31, 2018 and 2017. This difference is recorded as a regulatory asset.
 
Other Postretirement Benefits
 
Three Months
 
2018
 
2017
PPL
 
 
 
Service cost
$
1

 
$
2

Interest cost
3

 
6

Expected return on plan assets
(4
)
 
(6
)
Amortization of prior service cost
(1
)
 
—

Net periodic defined benefit costs (credits)
$
(1
)
 
$
2

 
 
 
 
LKE
 
 
 
Service cost
$
1

 
$
1

Interest cost
2

 
2

Expected return on plan assets
(2
)
 
(1
)
Net periodic defined benefit costs
$
1

 
$
2
PPL Electric Utilities Corp [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Allocation of Net Periodic Benefit Costs
For the periods ended March 31, 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
 
2018
 
2017
PPL Electric
$
4

 
$
8

LG&E
2

 
3

KU
1

 
4
LG And E And KU Energy LLC [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule Of Net Periodic Defined Benefit Costs (Credits)
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 March 31:
 
Pension Benefits
 
Three Months
 
U.S.
 
U.K.
 
2018
 
2017
 
2018
 
2017
PPL
 
 
 
 
 
 
 
Service cost
$
16

 
$
17

 
$
21

 
$
19

Interest cost
39

 
42

 
47

 
43

Expected return on plan assets
(62
)
 
(57
)
 
(150
)
 
(125
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
2

 
2

 
—

 
—

Actuarial loss
22

 
20

 
39

 
35

Net periodic defined benefit costs (credits) before settlements and special termination benefits
17

 
24

 
(43
)
 
(28
)
Special termination benefits (a)
—

 
2

 
—

 
—

Net periodic defined benefit costs (credits)
$
17

 
$
26

 
$
(43
)
 
$
(28
)

(a)
Enhanced pension benefits offered to certain PPL Electric bargaining unit employees under a one-time voluntary retirement window offered as part of the new five year IBEW contract ratified in March 2017.
 
Pension Benefits
 
Three Months
 
2018
 
2017
LKE
 
 
 
Service cost
$
7

 
$
7

Interest cost
16

 
16

Expected return on plan assets
(26
)
 
(22
)
Amortization of:
 
 
 
Prior service cost
2

 
2

Actuarial loss (a)
10

 
11

Net periodic defined benefit costs
$
9

 
$
14



(a)
As a result of treatment approved by the KPSC, the difference between actuarial loss calculated in accordance with LKE's accounting policy and actuarial loss calculated using a 15-year amortization period was $4 million and $5 million for the three months ended March 31, 2018 and 2017. This difference is recorded as a regulatory asset.
 
Pension Benefits
 
Three Months
 
2018
 
2017
LG&E
 
 
 
Interest cost
$
3

 
$
3

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

 
1

Actuarial loss (a)
2

 
3

Net periodic defined benefit costs
$
1

 
$
2


(a)
As a result of treatment approved by the KPSC, the difference between actuarial loss calculated in accordance with LG&E's accounting policy and actuarial loss calculated using a 15-year amortization period was $1 million for the three months ended March 31, 2018 and 2017. This difference is recorded as a regulatory asset.
 
Other Postretirement Benefits
 
Three Months
 
2018
 
2017
PPL
 
 
 
Service cost
$
1

 
$
2

Interest cost
3

 
6

Expected return on plan assets
(4
)
 
(6
)
Amortization of prior service cost
(1
)
 
—

Net periodic defined benefit costs (credits)
$
(1
)
 
$
2

 
 
 
 
LKE
 
 
 
Service cost
$
1

 
$
1

Interest cost
2

 
2

Expected return on plan assets
(2
)
 
(1
)
Net periodic defined benefit costs
$
1

 
$
2
Louisville Gas And Electric Co [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule Of Net Periodic Defined Benefit Costs (Credits)
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 March 31:
 
Pension Benefits
 
Three Months
 
U.S.
 
U.K.
 
2018
 
2017
 
2018
 
2017
PPL
 
 
 
 
 
 
 
Service cost
$
16

 
$
17

 
$
21

 
$
19

Interest cost
39

 
42

 
47

 
43

Expected return on plan assets
(62
)
 
(57
)
 
(150
)
 
(125
)
Amortization of:
 
 
 
 
 
 
 
Prior service cost
2

 
2

 
—

 
—

Actuarial loss
22

 
20

 
39

 
35

Net periodic defined benefit costs (credits) before settlements and special termination benefits
17

 
24

 
(43
)
 
(28
)
Special termination benefits (a)
—

 
2

 
—

 
—

Net periodic defined benefit costs (credits)
$
17

 
$
26

 
$
(43
)
 
$
(28
)

(a)
Enhanced pension benefits offered to certain PPL Electric bargaining unit employees under a one-time voluntary retirement window offered as part of the new five year IBEW contract ratified in March 2017.
 
Pension Benefits
 
Three Months
 
2018
 
2017
LKE
 
 
 
Service cost
$
7

 
$
7

Interest cost
16

 
16

Expected return on plan assets
(26
)
 
(22
)
Amortization of:
 
 
 
Prior service cost
2

 
2

Actuarial loss (a)
10

 
11

Net periodic defined benefit costs
$
9

 
$
14



(a)
As a result of treatment approved by the KPSC, the difference between actuarial loss calculated in accordance with LKE's accounting policy and actuarial loss calculated using a 15-year amortization period was $4 million and $5 million for the three months ended March 31, 2018 and 2017. This difference is recorded as a regulatory asset.
Allocation of Net Periodic Benefit Costs
For the periods ended March 31, 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
 
2018
 
2017
PPL Electric
$
4

 
$
8

LG&E
2

 
3

KU
1

 
4
Kentucky Utilities Co [Member]  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Allocation of Net Periodic Benefit Costs
For the periods ended March 31, 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
 
2018
 
2017
PPL Electric
$
4

 
$
8

LG&E
2

 
3

KU
1

 
4