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Defined Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Pension Plan [Member] | U.S. |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | $ 15 | $ 12 | $ 28 | $ 25
Interest cost | 36 | 41 | 74 | 82
Expected return on plan assets | (63) | (61) | (123) | (122)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 2 | 2 | 4 | 4
Actuarial loss | 24 | 14 | 44 | 27
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements | 14 | 8 | 27 | 16
Settlements | 0 | 0 | 0 | 1
Net periodic defined benefit costs (credits) | 14 | 8 | 27 | 17
Pension Plan [Member] | U.K. |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 21 | 17 | 44 | 34
Interest cost | 35 | 48 | 71 | 95
Expected return on plan assets | (151) | (150) | (309) | (298)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 0 | 0 | 0 | 0
Actuarial loss | 52 | 23 | 106 | 47
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements | (43) | (62) | (88) | (122)
Settlements | 0 | 0 | 0 | 0
Net periodic defined benefit costs (credits) | (43) | (62) | (88) | (122)
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 3 | 2
Interest cost | 5 | 5 | 10 | 11
Expected return on plan assets | (6) | (4) | (11) | (9)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 1 | 0 | 1 | 0
Net periodic defined benefit costs (credits) | 1 | 2 | 3 | 4
PPL Electric Utilities Corp [Member] | PPL Services [Member] |  |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |  |
Costs allocated to subsidiary by plan sponsors | 3 | 2 | 6 | 5
LG And E And KU Energy LLC [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 7 | 5 | 12 | 11
Interest cost | 13 | 17 | 29 | 33
Expected return on plan assets | (26) | (26) | (50) | (51)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 2 | 2 | 4 | 4
Actuarial loss | 10 | 6 | 19 | 10
Net periodic defined benefit costs (credits) | 6 | 4 | $ 14 | $ 7
Regulatory Asset Amortization Period |  |  | 15 years | 15 years
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period | 3 | 1 | $ 6 | $ 1
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost | 1 | 1 | 2 | 2
Interest cost | 2 | 2 | 4 | 4
Expected return on plan assets | (3) | (2) | (5) | (4)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 0 | 1 | 0 | 1
Actuarial loss | 0 | (1) | 0 | (1)
Net periodic defined benefit costs (credits) | 0 | 1 | 1 | 2
Louisville Gas And Electric Co [Member] | LKE [Member] |  |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |  |
Costs allocated to subsidiary by plan sponsors | 2 | 1 | 5 | 2
Louisville Gas And Electric Co [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract] |  |  |  |
Service cost |  | 1 |  | 1
Interest cost |  | 3 |  | 6
Expected return on plan assets |  | (5) |  | (11)
Amortization of: [Abstract] |  |  |  |
Prior service cost |  | 2 |  | 3
Actuarial loss |  | 1 |  | 3
Net periodic defined benefit costs (credits) |  | 2 |  | 2
Kentucky Utilities Co [Member] | LKE [Member] |  |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |  |
Costs allocated to subsidiary by plan sponsors | $ 0 | $ 0 | $ 1 | $ 0

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -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://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109237824&loc=SL108413299-114919 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -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 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4587-114921 + Details
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