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Defined Benefits (Tables) | 6 Months Ended
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Jun. 30, 2020
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 June 30:
| Pension Benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Three Months |  |  |  |  |  |  |  | Six Months |  |  |  |  |  |
| U.S. |  |  |  | U.K. |  |  |  | U.S. |  |  |  | U.K. |  |
| 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 15 |  |  | $ | 12 |  |  | $ | 21 |  |  | $ | 17 |  |  | $ | 28 |  |  | $ | 25 |  |  | $ | 44 |  |  | $ | 34 |
Interest cost | 36 |  |  | 41 |  |  | 35 |  |  | 48 |  |  | 74 |  |  | 82 |  |  | 71 |  |  | 95 |
Expected return on plan assets | (63) |  |  | (61) |  |  | (151) |  |  | (150) |  |  | (123) |  |  | (122) |  |  | (309) |  |  | (298) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 2 |  |  | — |  |  | — |  |  | 4 |  |  | 4 |  |  | — |  |  | — |
Actuarial loss | 24 |  |  | 14 |  |  | 52 |  |  | 23 |  |  | 44 |  |  | 27 |  |  | 106 |  |  | 47 |
Net periodic defined benefit costs (credits) before settlements | 14 |  |  | 8 |  |  | (43) |  |  | (62) |  |  | 27 |  |  | 16 |  |  | (88) |  |  | (122) |
Settlements | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |
Net periodic defined benefit costs (credits) | $ | 14 |  |  | $ | 8 |  |  | $ | (43) |  |  | $ | (62) |  |  | $ | 27 |  |  | $ | 17 |  |  | $ | (88) |  |  | $ | (122) |
| Other Postretirement Benefits |  |  |  |  |  |
| Three Months |  |  |  | Six Months |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
PPL |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 2 |
Interest cost | 5 |  |  | 5 |  |  | 10 |  |  | 11 |
Expected return on plan assets | (6) |  |  | (4) |  |  | (11) |  |  | (9) |
Amortization of prior service cost | 1 |  |  | — |  |  | 1 |  |  | — |
Net periodic defined benefit costs | $ | 1 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 4 |
LKE |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Expected return on plan assets | (3) |  |  | (2) |  |  | (5) |  |  | (4) |
Amortization of: |  |  |  |  |  |  |
Prior service cost | — |  |  | 1 |  |  | — |  |  | 1 |
Actuarial gain | — |  |  | (1) |  |  | — |  |  | (1) |
Net periodic defined benefit costs | $ | — |  |  | $ | 1 |  |  | $ | 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 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 |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
PPL Electric | $ | 3 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 5 |
LG&E (a) | 2 |  |  | 1 |  |  | 5 |  |  | 2 |
KU | — |  |  | — |  |  | 1 |  |  | — |
(a) Allocations to LG&E increased in 2020 primarily due to the merger of plans sponsored by LKE and LG&E effective January 1, 2020 into the LG&E and KU Pension Plan.
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 LG&E for the periods ended June 30:
| Pension Benefits |  |  |  |  |  |
| Three Months |  |  |  | Six Months |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
LKE |  |  |  |  |  |  |
Service cost | $ | 7 |  |  | $ | 5 |  |  | $ | 12 |  |  | $ | 11 |
Interest cost | 13 |  |  | 17 |  |  | 29 |  |  | 33 |
Expected return on plan assets | (26) |  |  | (26) |  |  | (50) |  |  | (51) |
Amortization of: |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Actuarial loss (a) | 10 |  |  | 6 |  |  | 19 |  |  | 10 |
Net periodic defined benefit costs | $ | 6 |  |  | $ | 4 |  |  | $ | 14 |  |  | $ | 7 |
(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 $3 million and $6 million for the three and six months ended June 30, 2020 and $1 million for the three and six months ended June 30, 2019. This difference is recorded as a regulatory asset.
| Other Postretirement Benefits |  |  |  |  |  |
| Three Months |  |  |  | Six Months |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
PPL |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | 2 |
Interest cost | 5 |  |  | 5 |  |  | 10 |  |  | 11 |
Expected return on plan assets | (6) |  |  | (4) |  |  | (11) |  |  | (9) |
Amortization of prior service cost | 1 |  |  | — |  |  | 1 |  |  | — |
Net periodic defined benefit costs | $ | 1 |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | 4 |
LKE |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Expected return on plan assets | (3) |  |  | (2) |  |  | (5) |  |  | (4) |
Amortization of: |  |  |  |  |  |  |
Prior service cost | — |  |  | 1 |  |  | — |  |  | 1 |
Actuarial gain | — |  |  | (1) |  |  | — |  |  | (1) |
Net periodic defined benefit costs | $ | — |  |  | $ | 1 |  |  | $ | 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 LG&E for the periods ended June 30:
|  |  | Pension Benefits |  |  |
|  |  | Three Months |  |  | Six Months
|  |  | 2019 (a) |  |  | 2019 (a)
LG&E |  |  |  |  |  |
Service cost |  |  | $ | 1 |  |  |  | $ | 1 |
Interest cost |  |  | 3 |  |  |  | 6 |
Expected return on plan assets |  |  | (5) |  |  |  | (11) |
Amortization of: |  |  |  |  |  |
Prior service cost |  |  | 2 |  |  |  | 3 |
Actuarial loss |  |  | 1 |  |  |  | 3 |
Net periodic defined benefit costs |  |  | $ | 2 |  |  |  | $ | 2 |
(a) The pension plans sponsored by LKE and LG&E were merged effective January 1, 2020 into the LG&E and KU Pension Plan, sponsored by LKE.
Allocation of Net Periodic Benefit Costs | 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 |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
PPL Electric | $ | 3 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 5 |
LG&E (a) | 2 |  |  | 1 |  |  | 5 |  |  | 2 |
KU | — |  |  | — |  |  | 1 |  |  | — |
(a) Allocations to LG&E increased in 2020 primarily due to the merger of plans sponsored by LKE and LG&E effective January 1, 2020 into the LG&E and KU Pension Plan.
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 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 |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
PPL Electric | $ | 3 |  |  | $ | 2 |  |  | $ | 6 |  |  | $ | 5 |
LG&E (a) | 2 |  |  | 1 |  |  | 5 |  |  | 2 |
KU | — |  |  | — |  |  | 1 |  |  | — |
(a) Allocations to LG&E increased in 2020 primarily due to the merger of plans sponsored by LKE and LG&E effective January 1, 2020 into the LG&E and KU Pension Plan.

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