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Retirement and Postemployment Benefits (Net Period Defined Benefit Costs (Credits) and Other Changes in Plan Assets and Benefit Obligations) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pension Plan [Member] | U.S. [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost | $ 56 | $ 50 | $ 62
Interest cost | 146 | 164 | 156
Expected return on plan assets | (246) | (245) | (249)
Amortization of: |  |  |
Prior service cost (credit) | 9 | 8 | 10
Actuarial (gain) loss | 89 | 56 | 84
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | 54 | 33 | 63
Settlements | 23 | 1 | 0
Net Periodic Defined Benefit Costs (Credits) | 77 | 34 | 63
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Settlement | (23) | (1) | 0
Net (gain) loss | (221) | (121) | 157
Prior service costs (credit) | 1 | 2 | 1
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (9) | (8) | (10)
Actuarial gain (loss) | (89) | (56) | (84)
Total recognized in OCI and regulatory assets/liabilities | (341) | (184) | 64
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | (264) | (150) | 127
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
OCI | (428) | (194) | 90
Regulatory assets/liabilities | 87 | 10 | (26)
Total recognized in OCI and regulatory assets/liabilities | (341) | (184) | 64
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | 40 | 18 | 40
Pension Plan [Member] | U.K. [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost | 89 | 68 | 82
Interest cost | 143 | 187 | 185
Expected return on plan assets | (622) | (588) | (587)
Amortization of: |  |  |
Prior service cost (credit) | 1 | 1 | 0
Actuarial (gain) loss | 213 | 92 | 151
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | (176) | (240) | (169)
Settlements | 0 | 0 | 0
Net Periodic Defined Benefit Costs (Credits) | (176) | (240) | (169)
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Settlement | 0 | 0 | 0
Net (gain) loss | 459 | 723 | 201
Prior service costs (credit) | 0 | 0 | 13
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (1) | (1) | 0
Actuarial gain (loss) | (213) | (92) | (151)
Total recognized in OCI and regulatory assets/liabilities | 245 | 630 | 63
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | 69 | 390 | (106)
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
Total recognized in OCI and regulatory assets/liabilities | 245 | 630 | 63
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | (237) | (287) | (226)
Other Postretirement Benefits Plan [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost | 6 | 6 | 7
Interest cost | 19 | 22 | 21
Expected return on plan assets | (21) | (18) | (23)
Amortization of: |  |  |
Prior service cost (credit) | 1 | (1) | (1)
Actuarial (gain) loss | 0 | 1 | 0
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | 5 | 10 | 4
Settlements | 0 | 0 | 0
Net Periodic Defined Benefit Costs (Credits) | 5 | 10 | 4
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Settlement | 0 | 0 | 0
Net (gain) loss | (6) | (18) | 8
Prior service costs (credit) | 5 | 0 | 0
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (1) | 1 | 1
Actuarial gain (loss) | 0 | (1) | 0
Total recognized in OCI and regulatory assets/liabilities | (2) | (18) | 9
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | 3 | (8) | 13
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
OCI | (12) | (13) | 20
Regulatory assets/liabilities | 10 | (5) | (11)
Total recognized in OCI and regulatory assets/liabilities | (2) | (18) | 9
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | 4 | 8 | 2
PPL Electric Utilities Corp [Member] | Pension Plan [Member] | U.S. [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | (2) | (4) | 4
PPL Electric Utilities Corp [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | 2 | 4 | (1)
LG And E And KU Energy LLC [Member] | Pension Plan [Member] | U.S. [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost | 24 | 22 | 25
Interest cost | 57 | 66 | 63
Expected return on plan assets | (101) | (101) | (102)
Amortization of: |  |  |
Prior service cost (credit) | 8 | 8 | 9
Actuarial (gain) loss | 41 | 22 | 35
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | 29 | 17 | 30
Settlements | 15 | 0 | 0
Net Periodic Defined Benefit Costs (Credits) | $ 44 | $ 17 | $ 30
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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 | $ 11 | $ (5) | $ 11
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Settlement | (15) | 0 | 0
Net (gain) loss | (29) | (37) | 40
Prior service costs (credit) | 2 | 2 | 0
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (8) | (8) | (9)
Actuarial gain (loss) | (41) | (22) | (35)
Total recognized in OCI and regulatory assets/liabilities | (91) | (65) | (4)
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | (47) | (48) | 26
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
OCI | (5) | 13 | (25)
Regulatory assets/liabilities | (86) | (78) | 21
Total recognized in OCI and regulatory assets/liabilities | (91) | (65) | (4)
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | $ 20 | $ 12 | $ 21
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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 | $ 11 | $ (5) | $ 11
LG And E And KU Energy LLC [Member] | Pension Plan [Member] | U.S. [Member] | Qualified Plan [Member] |  |  |
Amortization of: |  |  |
Settlements | 15 | 5 | 6
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost | 4 | 4 | 4
Interest cost | 7 | 8 | 8
Expected return on plan assets | (9) | (8) | (9)
Amortization of: |  |  |
Prior service cost (credit) | 1 | 1 | 1
Actuarial (gain) loss | (1) | (1) | 0
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | $ 2 | $ 4 | $ 4
Amortization period for the deferred recovery of a regulatory asset | 15 years | 15 years | 15 years
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Settlement | $ 0 | $ 0 | $ 0
Net (gain) loss | (1) | (14) | 1
Prior service costs (credit) | 5 | 0 | 0
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (1) | (1) | (1)
Actuarial gain (loss) | 1 | 1 | 0
Total recognized in OCI and regulatory assets/liabilities | 4 | (14) | 0
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | 6 | (10) | 4
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
OCI | (2) | (7) | 4
Regulatory assets/liabilities | 6 | (7) | (4)
Total recognized in OCI and regulatory assets/liabilities | 4 | (14) | 0
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | $ 1 | $ 2 | $ 3
Amortization period for the deferred recovery of a regulatory asset | 15 years | 15 years | 15 years
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits Plan [Member] | U.S. [Member] |  |  |
Amortization of: |  |  |
Settlements | $ 0 | $ 0 | $ 0
Net Periodic Defined Benefit Costs (Credits) | $ 2 | 4 | 4
Louisville Gas And Electric Co [Member] | Pension Plan [Member] |  |  |
Amortization of: |  |  |
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period |  | 3 | 2
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Deferred recovery of the difference between pension costs calculated with pension accounting policy and pension cost using 15 year amortization period |  | 3 | 2
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | U.S. [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost |  | 1 | 1
Interest cost |  | 11 | 12
Expected return on plan assets |  | (21) | (22)
Amortization of: |  |  |
Prior service cost (credit) |  | 5 | 5
Actuarial (gain) loss |  | 9 | 7
Net Periodic Defined Benefit Costs (Credits) |  | $ 5 | $ 3
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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) | $ (2) | $ (3)
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Net (gain) loss |  | (19) | 22
Prior service costs (credit) |  | 0 | 0
Amortization of: [Abstract] |  |  |
Prior service (cost) credit |  | (5) | (5)
Actuarial gain (loss) |  | (9) | (7)
Total recognized in OCI and regulatory assets/liabilities |  | (33) | 10
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities |  | (28) | 13
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
Total recognized in OCI and regulatory assets/liabilities |  | (33) | 10
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | $ 4 | $ 3 | $ 4
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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) | $ (2) | $ (3)
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | U.S. [Member] | Qualified Plan [Member] |  |  |
Amortization of: |  |  |
Settlements | $ 5 | 6 |
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | U.S. [Member] | LKE [Member] |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |
Costs allocated to subsidiary by plan sponsors |  | $ 0 | $ 2
Louisville Gas And Electric Co [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Amortization of: |  |  |
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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) | $ (2) | $ (3)
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | $ 2 | $ 2 | $ 2
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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) | $ (2) | $ (3)
Louisville Gas And Electric Co [Member] | Other Postretirement Benefits Plan [Member] | LKE [Member] |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |
Costs allocated to subsidiary by plan sponsors |  | $ 2 | $ 2
Kentucky Utilities Co [Member] | Pension Plan [Member] | U.S. [Member] |  |  |
Amortization of: |  |  |
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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 | $ (1) | $ (1) | $ (2)
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | $ 1 | $ (1) | $ 2
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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 | $ (1) | $ (1) | $ (2)
Kentucky Utilities Co [Member] | Other Postretirement Benefits Plan [Member] |  |  |
Amortization of: |  |  |
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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 | $ (1) | $ (1) | $ (2)
Net Periodic Defined Benefit Costs (Credits) Charged to Operating Expense or Regulatory Assets, Excluding Amounts Charged to Construction and Other Non-expense Accounts (Details) [Abstract] |  |  |
Net periodic defined benefit costs (credits) charged to operating expense or regulatory assets, excluding amounts charged to construction and other non-expense accounts | $ 0 | $ 0 | $ 1
Amortization period for the deferred recovery of a regulatory asset | 15 years | 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 | $ (1) | $ (1) | $ (2)

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- Definition The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income and regulatory assets or liabilities as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan. + References No definition available. + Details
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- Definition The pretax cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that occurred during the period. The cost has not yet been recognized in net periodic benefit cost. A plan amendment includes provisions that grant increased (decreased) benefits based on services rendered in prior periods. + References No definition available. + Details
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- Definition The net gain or loss previously recognized in other comprehensive income and regulatory assets or liabilities that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period. + References No definition available. + Details
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- Definition Aggregate amounts recognized in other comprehensive income and regulatory assets or liabilities (but not yet recognized in net periodic benefit cost). + References No definition available. + Details
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- Definition The net prior service cost or credit recognized in other comprehensive income and regulatory assets or liabilities that is a reclassification adjustment of other comprehensive income as a result of being recognized as a component of net periodic benefit cost for the period. + References No definition available. + Details
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- Definition The amount of net (gain) loss recognized in other comprehensive income and regulatory assets or liabilities as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts to cover vested benefits. + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 3: 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 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + Details
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