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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plan [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost | $ 35 | $ 34 | $ 51
Interest cost | 183 | 188 | 144
Expected return on plan assets | (299) | (309) | (276)
Amortization of: |  |  |
Prior service cost (credit) | 3 | 6 | 8
Actuarial (gain) loss | 10 | 2 | 51
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | (68) | (79) | (22)
Settlements | 0 | 0 | 23
Net Periodic Defined Benefit Costs (Credits) | (68) | (79) | 1
Net (loss)/gain allocated at acquisition | 0 | 0 | 33
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Settlement | 0 | 0 | (23)
Net (gain) loss | 134 | 193 | 242
Prior service costs (credit) | (13) | 2 | 0
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (3) | (6) | (8)
Actuarial gain (loss) | (10) | (2) | (51)
Total recognized in OCI and regulatory assets/liabilities | 108 | 187 | 193
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | 40 | 108 | 194
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
OCI | 25 | 52 | 142
Regulatory assets/liabilities | 83 | 135 | 51
Total recognized in OCI and regulatory assets/liabilities | 108 | 187 | 193
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 |  | 12 | 40
Other Postretirement Benefits Plan [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost | 6 | 6 | 7
Interest cost | 29 | 30 | 20
Expected return on plan assets | (30) | (30) | (28)
Amortization of: |  |  |
Prior service cost (credit) | 1 | 1 | 1
Actuarial (gain) loss | (5) | (5) | (5)
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | 1 | 2 | (5)
Settlements | 0 | 0 | 0
Net Periodic Defined Benefit Costs (Credits) | 1 | 2 | (5)
Net (loss)/gain allocated at acquisition | 0 | 0 | (49)
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 | (6) | 0
Prior service costs (credit) | 0 | 0 | 0
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (1) | (1) | (1)
Actuarial gain (loss) | 5 | 5 | 5
Total recognized in OCI and regulatory assets/liabilities | 5 | (2) | (45)
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | 6 | 0 | (50)
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
OCI | 2 | 0 | 13
Regulatory assets/liabilities | 3 | (2) | (58)
Total recognized in OCI and regulatory assets/liabilities | 5 | (2) | (45)
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) | 4
PPL Electric Utilities Corp [Member] | Pension 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 |  | (9) | (2)
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 |  | (1) | 2
Louisville Gas And Electric Co [Member] | Pension 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 | 0 | (1) | 4
Louisville Gas And Electric Co [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 | 2 | 2
Kentucky Utilities Co [Member] | Pension 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 | (3) | (3) | (1)
Kentucky Utilities Co [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 | $ 0 | $ 0 | $ 0

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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 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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