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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension Plan [Member] |  |  |
Net Periodic Defined Benefit Costs (Credits): [ Abstract] |  |  |
Service cost | $ 51 | $ 56 | $ 56
Interest cost | 144 | 121 | 146
Expected return on plan assets | (276) | (255) | (246)
Amortization of: |  |  |
Prior service cost (credit) | 8 | 8 | 9
Actuarial (gain) loss | 51 | 93 | 89
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | (22) | 23 | 54
Settlements | 23 | 18 | 23
Net Periodic Defined Benefit Costs (Credits) | 1 | 41 | 77
Net (loss)/gain allocated at acquisition | 33 | 0 | 0
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Settlement | (23) | (18) | (23)
Net (gain) loss | 242 | 42 | (221)
Prior service costs (credit) | 0 | 3 | 1
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (8) | (8) | (9)
Actuarial gain (loss) | (51) | (93) | (89)
Total recognized in OCI and regulatory assets/liabilities | 193 | (74) | (341)
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | 194 | (33) | (264)
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
OCI | 142 | (70) | (428)
Regulatory assets/liabilities | 51 | (4) | 87
Total recognized in OCI and regulatory assets/liabilities | 193 | (74) | (341)
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 | 7 | 6 | 6
Interest cost | 20 | 16 | 19
Expected return on plan assets | (28) | (23) | (21)
Amortization of: |  |  |
Prior service cost (credit) | 1 | 1 | 1
Actuarial (gain) loss | (5) | (1) | 0
Net periodic defined benefit costs (credits) prior to settlements and termination benefits | (5) | (1) | 5
Settlements | 0 | 0 | 0
Net Periodic Defined Benefit Costs (Credits) | (5) | (1) | 5
Net (loss)/gain allocated at acquisition | (49) | 0 | 0
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross: [Abstract] |  |  |
Settlement | 0 | 0 | 0
Net (gain) loss | 0 | (53) | (6)
Prior service costs (credit) | 0 | 0 | 5
Amortization of: [Abstract] |  |  |
Prior service (cost) credit | (1) | (1) | (1)
Actuarial gain (loss) | 5 | 1 | 0
Total recognized in OCI and regulatory assets/liabilities | (45) | (53) | (2)
Total recognized in net periodic benefit costs, OCI and regulatory assets/liabilities | (50) | (54) | 3
Other Changes in Plan Assets and Benefit Obligations Recognized in OCI and Regulatory Assets/Liabilities - Gross (Details) [Abstract] |  |  |
OCI | 13 | (42) | (12)
Regulatory assets/liabilities | (58) | (11) | 10
Total recognized in OCI and regulatory assets/liabilities | (45) | (53) | (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) | 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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