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Defined Benefits (Tables) | 3 Months Ended
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Mar. 31, 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 March 31:
| Pension Benefits
| Three Months
| U.S. |  | U.K.
| 2020 |  | 2019 |  | 2020 |  | 2019
PPL |  |  |  |  |  |  |
Service cost | $ | 13 |  |  | $ | 13 |  |  | $ | 23 |  |  | $ | 17 |
Interest cost | 38 |  |  | 41 |  |  | 36 |  |  | 47 |
Expected return on plan assets | (60 | ) |  | (61 | ) |  | (158 | ) |  | (148 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 2 |  |  | — |  |  | — |
Actuarial loss | 20 |  |  | 13 |  |  | 54 |  |  | 24 |
Net periodic defined benefit costs (credits) before settlements | 13 |  |  | 8 |  |  | (45 | ) |  | (60 | )
Settlements | — |  |  | 1 |  |  | — |  |  | — |
Net periodic defined benefit costs (credits) | $ | 13 |  |  | $ | 9 |  |  | $ | (45 | ) |  | $ | (60 | )
| Other Postretirement Benefits
| Three Months
| 2020 |  | 2019
PPL |  |  |
Service cost | $ | 2 |  |  | $ | 1 |
Interest cost | 5 |  |  | 6 |
Expected return on plan assets | (5 | ) |  | (5 | )
Net periodic defined benefit costs | $ | 2 |  |  | $ | 2 |
LKE |  |  |
Service cost | $ | 1 |  |  | $ | 1 |
Interest cost | 2 |  |  | 2 |
Expected return on plan assets | (2 | ) |  | (2 | )
Net periodic defined benefit costs | $ | 1 |  |  | $ | 1 |
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
| 2020 |  | 2019
PPL Electric | $ | 3 |  |  | $ | 3 |
LG&E (a) | 3 |  |  | 1 |
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) |
| Pension Benefits
| Three Months
| 2020 |  | 2019
LKE |  |  |
Service cost | $ | 5 |  |  | $ | 6 |
Interest cost | 16 |  |  | 16 |
Expected return on plan assets | (24 | ) |  | (25 | )
Amortization of: |  |  |
Prior service cost | 2 |  |  | 2 |
Actuarial loss (a) | 9 |  |  | 4 |
Net periodic defined benefit costs | $ | 8 |  |  | $ | 3 |
(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 for the three months ended March 31, 2020 and not significant for the three months ended March 31, 2019. This difference is recorded as a regulatory asset.
| Other Postretirement Benefits
| Three Months
| 2020 |  | 2019
PPL |  |  |
Service cost | $ | 2 |  |  | $ | 1 |
Interest cost | 5 |  |  | 6 |
Expected return on plan assets | (5 | ) |  | (5 | )
Net periodic defined benefit costs | $ | 2 |  |  | $ | 2 |
LKE |  |  |
Service cost | $ | 1 |  |  | $ | 1 |
Interest cost | 2 |  |  | 2 |
Expected return on plan assets | (2 | ) |  | (2 | )
Net periodic defined benefit costs | $ | 1 |  |  | $ | 1 |
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 March 31:
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) |
| Pension Benefits
| Three Months
| 2019 (a)
LG&E |
Interest cost | $ | 3 |
Expected return on plan assets | (6 | )
Amortization of: |
Prior service cost | 1 |
Actuarial loss | 2 |
Net periodic defined benefit costs | $ | — |
(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
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 March 31:
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
| 2020 |  | 2019
PPL Electric | $ | 3 |  |  | $ | 3 |
LG&E (a) | 3 |  |  | 1 |
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 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
| 2020 |  | 2019
PPL Electric | $ | 3 |  |  | $ | 3 |
LG&E (a) | 3 |  |  | 1 |
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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- Definition Tabular disclosure of net periodic benefit cost allocated to affiliates by the plan-sponsoring entity. These amounts include amounts applied to accounts that are further distributed between capital and expense during the period. + References No definition available. + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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