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Defined Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Pension Plan [Member] | U.S. |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | $ 13 | $ 15 | $ 38 | $ 46
Interest cost | 41 | 39 | 123 | 117
Expected return on plan assets | (62) | (62) | (184) | (186)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 2 | 2 | 6 | 7
Actuarial loss | 15 | 22 | 42 | 63
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements | 9 | 16 | 25 | 47
Settlements | 0 | 0 | 1 | 0
Net periodic defined benefit costs (credits) | 9 | 16 | 26 | 47
Pension Plan [Member] | U.K. |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 17 | 21 | 51 | 63
Interest cost | 45 | 46 | 140 | 140
Expected return on plan assets | (144) | (145) | (442) | (445)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 1 | 0 | 1 | 0
Actuarial loss | 22 | 37 | 69 | 114
Net Periodic Defined Benefit Costs (Credits) Prior To Settlements | (59) | (41) | (181) | (128)
Settlements | 0 | 0 | 0 | 0
Net periodic defined benefit costs (credits) | (59) | (41) | (181) | (128)
Other Postretirement Benefits Plan [Member] |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 2 | 1 | 4 | 5
Interest cost | 5 | 5 | 16 | 15
Expected return on plan assets | (5) | (4) | (14) | (17)
Amortization of: [Abstract] |  |  |  |
Actuarial loss | 1 | 0 | 1 | 0
Net periodic defined benefit costs (credits) | 3 | 2 | 7 | 3
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 | 5 | 8 | 12
LG And E And KU Energy LLC [Member] | Pension Plan [Member] |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 5 | 6 | 16 | 18
Interest cost | 16 | 16 | 49 | 48
Expected return on plan assets | (25) | (25) | (76) | (76)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 2 | 3 | 6 | 7
Actuarial loss | 7 | 8 | 17 | 26
Net periodic defined benefit costs (credits) | $ 5 | $ 8 | $ 12 | $ 23
Regulatory Asset Amortization Period | 15 years | 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 | $ 2 | $ 2 | $ 3 | $ 8
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 | 3 | 3
Interest cost | 2 | 2 | 6 | 6
Expected return on plan assets | (2) | (2) | (6) | (6)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 0 | 0 | 1 | 1
Actuarial loss | 0 | 0 | (1) | (1)
Net periodic defined benefit costs (credits) | 1 | 1 | 3 | 3
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 | 1 | 1 | 3 | 5
Louisville Gas And Electric Co [Member] | Pension Plan [Member] |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 0 | 0 | 1 | 1
Interest cost | 2 | 3 | 8 | 9
Expected return on plan assets | (5) | (6) | (16) | (17)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 1 | 1 | 4 | 4
Actuarial loss | 4 | 2 | 7 | 5
Net periodic defined benefit costs (credits) | $ 2 | $ 0 | $ 4 | $ 2
Regulatory Asset Amortization Period | 15 years | 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 |  | $ 2 | $ 1
Louisville Gas And Electric Co [Member] | Qualified Plan [Member] | Pension Plan [Member] | U.S. |  |  |  |
Amortization of: [Abstract] |  |  |  |
Settlements | 5 | $ 1 | 5 | 5
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 | $ 1 | $ 0 | $ 3

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