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Defined Benefits (Tables) | 6 Months Ended
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Jun. 30, 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 June 30:
| Pension Benefits
| Three Months |  | Six Months
| U.S. |  | U.K. |  | U.S. |  | U.K.
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 15 |  |  | $ | 15 |  |  | $ | 21 |  |  | $ | 18 |  |  | $ | 31 |  |  | $ | 32 |  |  | $ | 42 |  |  | $ | 37 |
Interest cost | 39 |  |  | 42 |  |  | 47 |  |  | 44 |  |  | 78 |  |  | 84 |  |  | 94 |  |  | 87 |
Expected return on plan assets | (62 | ) |  | (58 | ) |  | (150 | ) |  | (127 | ) |  | (124 | ) |  | (115 | ) |  | (300 | ) |  | (252 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost | 3 |  |  | 3 |  |  | — |  |  | — |  |  | 5 |  |  | 5 |  |  | — |  |  | — |
Actuarial loss | 19 |  |  | 14 |  |  | 38 |  |  | 36 |  |  | 41 |  |  | 34 |  |  | 77 |  |  | 71 |
Net periodic defined benefit costs (credits) before special termination benefits | 14 |  |  | 16 |  |  | (44 | ) |  | (29 | ) |  | 31 |  |  | 40 |  |  | (87 | ) |  | (57 | )
Special termination benefits (a) | — |  |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |
Net periodic defined benefit costs (credits) | $ | 14 |  |  | $ | 15 |  |  | $ | (44 | ) |  | $ | (29 | ) |  | $ | 31 |  |  | $ | 41 |  |  | $ | (87 | ) |  | $ | (57 | )
(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 |  | Six Months
| 2018 |  | 2017 |  | 2018 |  | 2017
LKE |  |  |  |  |  |  |
Service cost | $ | 5 |  |  | $ | 5 |  |  | $ | 12 |  |  | $ | 12 |
Interest cost | 16 |  |  | 18 |  |  | 32 |  |  | 34 |
Expected return on plan assets | (25 | ) |  | (24 | ) |  | (51 | ) |  | (46 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Actuarial loss (a) | 8 |  |  | 4 |  |  | 18 |  |  | 15 |
Net periodic defined benefit costs (b) | $ | 6 |  |  | $ | 5 |  |  | $ | 15 |  |  | $ | 19 |
(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 $6 million for the three and six months ended June 30, 2018 and $5 million for the six months ended June 30, 2017. 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 $4 million was incurred. In accordance with existing regulatory accounting treatment, LG&E has maintained the settlement charge in regulatory assets. The amount will be amortized in accordance with existing regulatory practice.
| Pension Benefits
| Three Months |  | Six Months
| 2018 |  | 2017 |  | 2018 |  | 2017
LG&E |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 3 |  |  | 3 |  |  | 6 |  |  | 6 |
Expected return on plan assets | (6 | ) |  | (6 | ) |  | (11 | ) |  | (11 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 1 |  |  | 3 |  |  | 2 |
Actuarial loss (a) | 1 |  |  | 1 |  |  | 3 |  |  | 4 |
Net periodic defined benefit costs (b) | $ | 1 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 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 six months ended June 30, 2018 and 2017. 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 $4 million was incurred. In accordance with existing regulatory accounting treatment, LG&E has maintained the settlement charge in regulatory assets. The amount will be amortized in accordance with existing regulatory practice.
| Other Postretirement Benefits
| Three Months |  | Six Months
| 2018 |  | 2017 |  | 2018 |  | 2017
PPL |  |  |  |  |  |  |
Service cost | $ | 3 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 4 |
Interest cost | 7 |  |  | 6 |  |  | 10 |  |  | 12 |
Expected return on plan assets | (9 | ) |  | (5 | ) |  | (13 | ) |  | (11 | )
Amortization of prior service cost | 1 |  |  | (1 | ) |  | — |  |  | (1 | )
Net periodic defined benefit costs | $ | 2 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 4 |
LKE |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Expected return on plan assets | (2 | ) |  | (2 | ) |  | (4 | ) |  | (3 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 1 |  |  | — |  |  | 1 |  |  | — |
Actuarial gain | (1 | ) |  | — |  |  | (1 | ) |  | — |
Net periodic defined benefit costs | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 3 |
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
| 2018 |  | 2017 |  | 2018 |  | 2017
PPL Electric | $ | 3 |  |  | $ | 5 |  |  | $ | 7 |  |  | $ | 13 |
LG&E | 2 |  |  | 2 |  |  | 4 |  |  | 5 |
KU | 1 |  |  | 1 |  |  | 2 |  |  | 5 |
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 June 30:
| Pension Benefits
| Three Months |  | Six Months
| U.S. |  | U.K. |  | U.S. |  | U.K.
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 15 |  |  | $ | 15 |  |  | $ | 21 |  |  | $ | 18 |  |  | $ | 31 |  |  | $ | 32 |  |  | $ | 42 |  |  | $ | 37 |
Interest cost | 39 |  |  | 42 |  |  | 47 |  |  | 44 |  |  | 78 |  |  | 84 |  |  | 94 |  |  | 87 |
Expected return on plan assets | (62 | ) |  | (58 | ) |  | (150 | ) |  | (127 | ) |  | (124 | ) |  | (115 | ) |  | (300 | ) |  | (252 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost | 3 |  |  | 3 |  |  | — |  |  | — |  |  | 5 |  |  | 5 |  |  | — |  |  | — |
Actuarial loss | 19 |  |  | 14 |  |  | 38 |  |  | 36 |  |  | 41 |  |  | 34 |  |  | 77 |  |  | 71 |
Net periodic defined benefit costs (credits) before special termination benefits | 14 |  |  | 16 |  |  | (44 | ) |  | (29 | ) |  | 31 |  |  | 40 |  |  | (87 | ) |  | (57 | )
Special termination benefits (a) | — |  |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |
Net periodic defined benefit costs (credits) | $ | 14 |  |  | $ | 15 |  |  | $ | (44 | ) |  | $ | (29 | ) |  | $ | 31 |  |  | $ | 41 |  |  | $ | (87 | ) |  | $ | (57 | )
(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 |  | Six Months
| 2018 |  | 2017 |  | 2018 |  | 2017
LKE |  |  |  |  |  |  |
Service cost | $ | 5 |  |  | $ | 5 |  |  | $ | 12 |  |  | $ | 12 |
Interest cost | 16 |  |  | 18 |  |  | 32 |  |  | 34 |
Expected return on plan assets | (25 | ) |  | (24 | ) |  | (51 | ) |  | (46 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Actuarial loss (a) | 8 |  |  | 4 |  |  | 18 |  |  | 15 |
Net periodic defined benefit costs (b) | $ | 6 |  |  | $ | 5 |  |  | $ | 15 |  |  | $ | 19 |
(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 $6 million for the three and six months ended June 30, 2018 and $5 million for the six months ended June 30, 2017. 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 $4 million was incurred. In accordance with existing regulatory accounting treatment, LG&E has maintained the settlement charge in regulatory assets. The amount will be amortized in accordance with existing regulatory practice.
| Pension Benefits
| Three Months |  | Six Months
| 2018 |  | 2017 |  | 2018 |  | 2017
LG&E |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 3 |  |  | 3 |  |  | 6 |  |  | 6 |
Expected return on plan assets | (6 | ) |  | (6 | ) |  | (11 | ) |  | (11 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 1 |  |  | 3 |  |  | 2 |
Actuarial loss (a) | 1 |  |  | 1 |  |  | 3 |  |  | 4 |
Net periodic defined benefit costs (b) | $ | 1 |  |  | $ | — |  |  | $ | 2 |  |  | $ | 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 six months ended June 30, 2018 and 2017. 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 $4 million was incurred. In accordance with existing regulatory accounting treatment, LG&E has maintained the settlement charge in regulatory assets. The amount will be amortized in accordance with existing regulatory practice.
| Other Postretirement Benefits
| Three Months |  | Six Months
| 2018 |  | 2017 |  | 2018 |  | 2017
PPL |  |  |  |  |  |  |
Service cost | $ | 3 |  |  | $ | 2 |  |  | $ | 4 |  |  | $ | 4 |
Interest cost | 7 |  |  | 6 |  |  | 10 |  |  | 12 |
Expected return on plan assets | (9 | ) |  | (5 | ) |  | (13 | ) |  | (11 | )
Amortization of prior service cost | 1 |  |  | (1 | ) |  | — |  |  | (1 | )
Net periodic defined benefit costs | $ | 2 |  |  | $ | 2 |  |  | $ | 1 |  |  | $ | 4 |
LKE |  |  |  |  |  |  |
Service cost | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Expected return on plan assets | (2 | ) |  | (2 | ) |  | (4 | ) |  | (3 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 1 |  |  | — |  |  | 1 |  |  | — |
Actuarial gain | (1 | ) |  | — |  |  | (1 | ) |  | — |
Net periodic defined benefit costs | $ | 1 |  |  | $ | 1 |  |  | $ | 2 |  |  | $ | 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 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.
| 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
PPL |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost | $ | 15 |  |  | $ | 15 |  |  | $ | 21 |  |  | $ | 18 |  |  | $ | 31 |  |  | $ | 32 |  |  | $ | 42 |  |  | $ | 37 |
Interest cost | 39 |  |  | 42 |  |  | 47 |  |  | 44 |  |  | 78 |  |  | 84 |  |  | 94 |  |  | 87 |
Expected return on plan assets | (62 | ) |  | (58 | ) |  | (150 | ) |  | (127 | ) |  | (124 | ) |  | (115 | ) |  | (300 | ) |  | (252 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prior service cost | 3 |  |  | 3 |  |  | — |  |  | — |  |  | 5 |  |  | 5 |  |  | — |  |  | — |
Actuarial loss | 19 |  |  | 14 |  |  | 38 |  |  | 36 |  |  | 41 |  |  | 34 |  |  | 77 |  |  | 71 |
Net periodic defined benefit costs (credits) before special termination benefits | 14 |  |  | 16 |  |  | (44 | ) |  | (29 | ) |  | 31 |  |  | 40 |  |  | (87 | ) |  | (57 | )
Special termination benefits (a) | — |  |  | (1 | ) |  | — |  |  | — |  |  | — |  |  | 1 |  |  | — |  |  | — |
Net periodic defined benefit costs (credits) | $ | 14 |  |  | $ | 15 |  |  | $ | (44 | ) |  | $ | (29 | ) |  | $ | 31 |  |  | $ | 41 |  |  | $ | (87 | ) |  | $ | (57 | )
(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 |  | Six Months
| 2018 |  | 2017 |  | 2018 |  | 2017
LKE |  |  |  |  |  |  |
Service cost | $ | 5 |  |  | $ | 5 |  |  | $ | 12 |  |  | $ | 12 |
Interest cost | 16 |  |  | 18 |  |  | 32 |  |  | 34 |
Expected return on plan assets | (25 | ) |  | (24 | ) |  | (51 | ) |  | (46 | )
Amortization of: |  |  |  |  |  |  |
Prior service cost | 2 |  |  | 2 |  |  | 4 |  |  | 4 |
Actuarial loss (a) | 8 |  |  | 4 |  |  | 18 |  |  | 15 |
Net periodic defined benefit costs (b) | $ | 6 |  |  | $ | 5 |  |  | $ | 15 |  |  | $ | 19 |
(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 $6 million for the three and six months ended June 30, 2018 and $5 million for the six months ended June 30, 2017. This difference is recorded as a regulatory asset.
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
| 2018 |  | 2017 |  | 2018 |  | 2017
PPL Electric | $ | 3 |  |  | $ | 5 |  |  | $ | 7 |  |  | $ | 13 |
LG&E | 2 |  |  | 2 |  |  | 4 |  |  | 5 |
KU | 1 |  |  | 1 |  |  | 2 |  |  | 5 |
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
| 2018 |  | 2017 |  | 2018 |  | 2017
PPL Electric | $ | 3 |  |  | $ | 5 |  |  | $ | 7 |  |  | $ | 13 |
LG&E | 2 |  |  | 2 |  |  | 4 |  |  | 5 |
KU | 1 |  |  | 1 |  |  | 2 |  |  | 5 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=77993564&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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