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Defined Benefits (Tables) | 9 Months Ended
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Sep. 30, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule Of Net Periodic Defined Benefit Costs (Credits) |
| Other Postretirement Benefits
| Three Months |  | Nine Months
| 2019 |  | 2018 |  | 2019 |  | 2018
PPL |  |  |  |  |  |  |
Service cost | $ | 2 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 5 |
Interest cost | 5 |  |  | 5 |  |  | 16 |  |  | 15 |
Expected return on plan assets | (5 | ) |  | (4 | ) |  | (14 | ) |  | (17 | )
Amortization of actuarial loss | 1 |  |  | — |  |  | 1 |  |  | — |
Net periodic defined benefit costs | $ | 3 |  |  | $ | 2 |  |  | $ | 7 |  |  | $ | 3 |
LKE |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 3 |
Interest cost | 2 |  |  | 2 |  |  | 6 |  |  | 6 |
Expected return on plan assets | (2 | ) |  | (2 | ) |  | (6 | ) |  | (6 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | — |  |  | — |  |  | 1 |  |  | 1 |
Actuarial gain | — |  |  | — |  |  | (1 | ) |  | (1 | )
Net periodic defined benefit costs | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 3 |
Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL and its subsidiaries, LKE, and LG&E for the periods ended September 30:
| Pension Benefits
| Three Months |  | Nine Months
| U.S. |  | U.K. |  | U.S. |  | U.K.
| 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 13 |  |  | $ | 15 |  |  | $ | 17 |  |  | $ | 21 |  |  | $ | 38 |  |  | $ | 46 |  |  | $ | 51 |  |  | $ | 63 |
Interest cost | 41 |  |  | 39 |  |  | 45 |  |  | 46 |  |  | 123 |  |  | 117 |  |  | 140 |  |  | 140 |
Expected return on plan assets | (62 | ) |  | (62 | ) |  | (144 | ) |  | (145 | ) |  | (184 | ) |  | (186 | ) |  | (442 | ) |  | (445 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 2 |  |  | 1 |  |  | — |  |  | 6 |  |  | 7 |  |  | 1 |  |  | — |
Actuarial loss | 15 |  |  | 22 |  |  | 22 |  |  | 37 |  |  | 42 |  |  | 63 |  |  | 69 |  |  | 114 |
Net periodic defined benefit costs (credits) before settlements | 9 |  |  | 16 |  |  | (59 | ) |  | (41 | ) |  | 25 |  |  | 47 |  |  | (181 | ) |  | (128 | )
Settlements | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |  |  | — |
Net periodic defined benefit costs (credits) | $ | 9 |  |  | $ | 16 |  |  | $ | (59 | ) |  | $ | (41 | ) |  | $ | 26 |  |  | $ | 47 |  |  | $ | (181 | ) |  | $ | (128 | )
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 September 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 |  | Nine Months
| 2019 |  | 2018 |  | 2019 |  | 2018
PPL Electric | $ | 3 |  |  | $ | 5 |  |  | $ | 8 |  |  | $ | 12 |
LG&E | 1 |  |  | 1 |  |  | 3 |  |  | 5 |
KU | — |  |  | 1 |  |  | — |  |  | 3 |
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) |
| Pension Benefits
| Three Months |  | Nine Months
| 2019 |  | 2018 |  | 2019 |  | 2018
LKE |  |  |  |  |  |  |
Service cost | $ | 5 |  |  | $ | 6 |  |  | $ | 16 |  |  | $ | 18 |
Interest cost | 16 |  |  | 16 |  |  | 49 |  |  | 48 |
Expected return on plan assets | (25 | ) |  | (25 | ) |  | (76 | ) |  | (76 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 3 |  |  | 6 |  |  | 7 |
Actuarial loss (a) | 7 |  |  | 8 |  |  | 17 |  |  | 26 |
Net periodic defined benefit costs (b) | $ | 5 |  |  | $ | 8 |  |  | $ | 12 |  |  | $ | 23 |
(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 $2 million and $3 million for the three and nine months ended September 30, 2019 and $2 million and $8 million for the three and nine months ended September 30, 2018. This difference is recorded as a regulatory asset.
(b) Due to the amount of lump sum payment distributions from the LG&E qualified pension plan, a settlement charge of $5 million for the three and nine months ended September 30, 2019 and $1 million and $5 million for the three and nine months ended September 30, 2018 was incurred. In accordance with existing regulatory accounting treatment, LG&E has maintained the settlement charge in regulatory assets. The amount is being amortized in accordance with existing regulatory practice. Following are the net periodic defined benefit costs (credits) of the plans sponsored by PPL and its subsidiaries, LKE, and LG&E for the periods ended September 30:
| Other Postretirement Benefits
| Three Months |  | Nine Months
| 2019 |  | 2018 |  | 2019 |  | 2018
PPL |  |  |  |  |  |  |
Service cost | $ | 2 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 5 |
Interest cost | 5 |  |  | 5 |  |  | 16 |  |  | 15 |
Expected return on plan assets | (5 | ) |  | (4 | ) |  | (14 | ) |  | (17 | )
Amortization of actuarial loss | 1 |  |  | — |  |  | 1 |  |  | — |
Net periodic defined benefit costs | $ | 3 |  |  | $ | 2 |  |  | $ | 7 |  |  | $ | 3 |
LKE |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 3 |
Interest cost | 2 |  |  | 2 |  |  | 6 |  |  | 6 |
Expected return on plan assets | (2 | ) |  | (2 | ) |  | (6 | ) |  | (6 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | — |  |  | — |  |  | 1 |  |  | 1 |
Actuarial gain | — |  |  | — |  |  | (1 | ) |  | (1 | )
Net periodic defined benefit costs | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 3 |
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 LG&E for the periods ended September 30:
| Pension Benefits
| Three Months |  | Nine Months
| 2019 |  | 2018 |  | 2019 |  | 2018
LG&E |  |  |  |  |  |  |
Service cost | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 2 |  |  | 3 |  |  | 8 |  |  | 9 |
Expected return on plan assets | (5 | ) |  | (6 | ) |  | (16 | ) |  | (17 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 1 |  |  | 1 |  |  | 4 |  |  | 4 |
Actuarial loss (a) | 4 |  |  | 2 |  |  | 7 |  |  | 5 |
Net periodic defined benefit costs (b) | $ | 2 |  |  | $ | — |  |  | $ | 4 |  |  | $ | 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 and $2 million for the three and nine months ended September 30, 2019 and $1 million for the nine months ended September 30, 2018. This difference is recorded as a regulatory asset.
(b) Due to the amount of lump sum payment distributions from the LG&E qualified pension plan, a settlement charge of $5 million for the three and nine months ended September 30, 2019 and $1 million and $5 million for the three and nine months ended September 30, 2018 was incurred. In accordance with existing regulatory accounting treatment, LG&E has maintained the settlement charge in regulatory assets. The amount is being amortized in accordance with existing regulatory practice.
Allocation of Net Periodic Benefit Costs | For the periods ended September 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 |  | Nine Months
| 2019 |  | 2018 |  | 2019 |  | 2018
PPL Electric | $ | 3 |  |  | $ | 5 |  |  | $ | 8 |  |  | $ | 12 |
LG&E | 1 |  |  | 1 |  |  | 3 |  |  | 5 |
KU | — |  |  | 1 |  |  | — |  |  | 3 |
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 September 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 |  | Nine Months
| 2019 |  | 2018 |  | 2019 |  | 2018
PPL Electric | $ | 3 |  |  | $ | 5 |  |  | $ | 8 |  |  | $ | 12 |
LG&E | 1 |  |  | 1 |  |  | 3 |  |  | 5 |
KU | — |  |  | 1 |  |  | — |  |  | 3 |

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