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Defined Benefits (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Pension Plan [Member] | U.S. |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | $ 13 | $ 13
Interest cost | 38 | 41
Expected return on plan assets | (60) | (61)
Amortization of: [Abstract] |  |
Prior service cost | 2 | 2
Actuarial loss | 20 | 13
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements | 13 | 8
Settlements | 0 | 1
Net periodic defined benefit costs (credits) | 13 | 9
Pension Plan [Member] | U.K. |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | 23 | 17
Interest cost | 36 | 47
Expected return on plan assets | (158) | (148)
Amortization of: [Abstract] |  |
Prior service cost | 0 | 0
Actuarial loss | 54 | 24
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements | (45) | (60)
Settlements | 0 | 0
Net periodic defined benefit costs (credits) | (45) | (60)
Other Postretirement Benefits Plan [Member] |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | 2 | 1
Interest cost | 5 | 6
Expected return on plan assets | (5) | (5)
Amortization of: [Abstract] |  |
Net periodic defined benefit costs (credits) | 2 | 2
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 | 3
LG And E And KU Energy LLC [Member] | Pension Plan [Member] |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | 5 | 6
Interest cost | 16 | 16
Expected return on plan assets | (24) | (25)
Amortization of: [Abstract] |  |
Prior service cost | 2 | 2
Actuarial loss | 9 | 4
Net periodic defined benefit costs (credits) | $ 8 | $ 3
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 |
LG And E And KU Energy LLC [Member] | Other Postretirement Benefits Plan [Member] |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | 1 | $ 1
Interest cost | 2 | 2
Expected return on plan assets | (2) | (2)
Amortization of: [Abstract] |  |
Net periodic defined benefit costs (credits) | 1 | 1
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 | 3 | 1
Louisville Gas And Electric Co [Member] | Pension Plan [Member] |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Interest cost |  | 3
Expected return on plan assets |  | (6)
Amortization of: [Abstract] |  |
Prior service cost |  | 1
Actuarial loss |  | 2
Net periodic defined benefit costs (credits) |  | 0
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 | $ 1 | $ 0

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