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Defined Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |  |
Collective Bargaining Agreement Term |  |  | 5 years |
Pension Plan [Member] | U.S. |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | $ 15 | $ 15 | $ 31 | $ 32
Interest cost | 39 | 42 | 78 | 84
Expected return on plan assets | (62) | (58) | (124) | (115)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 3 | 3 | 5 | 5
Actuarial loss | 19 | 14 | 41 | 34
Net periodic defined benefit costs (credits) before special termination benefits | 14 | 16 | 31 | 40
Special termination benefits | 0 | (1) | 0 | 1
Net periodic defined benefit costs (credits) | 14 | 15 | 31 | 41
Pension Plan [Member] | U.K. |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 21 | 18 | 42 | 37
Interest cost | 47 | 44 | 94 | 87
Expected return on plan assets | (150) | (127) | (300) | (252)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 0 | 0 | 0 | 0
Actuarial loss | 38 | 36 | 77 | 71
Net periodic defined benefit costs (credits) before special termination benefits | (44) | (29) | (87) | (57)
Special termination benefits | 0 | 0 | 0 | 0
Net periodic defined benefit costs (credits) | (44) | (29) | (87) | (57)
Other Postretirement Benefits Plan [Member] |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 3 | 2 | 4 | 4
Interest cost | 7 | 6 | 10 | 12
Expected return on plan assets | (9) | (5) | (13) | (11)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 1 | (1) | 0 | (1)
Net periodic defined benefit costs (credits) | 2 | 2 | 1 | 4
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 | 7 | 13
LG And E And KU Energy LLC [Member] | Pension Plan [Member] |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 5 | 5 | 12 | 12
Interest cost | 16 | 18 | 32 | 34
Expected return on plan assets | (25) | (24) | (51) | (46)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 2 | 2 | 4 | 4
Actuarial loss | $ 8 | 4 | $ 18 | $ 15
Regulatory Asset Amortization Period | 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 |  | $ 6 | $ 5
Net periodic defined benefit costs (credits) | 6 | 5 | 15 | 19
LG And E And KU Energy LLC [Member] | Pension Plan [Member] | U.S. | Qualified Plan [Member] |  |  |  |
Amortization of: [Abstract] |  |  |  |
Settlements |  |  | 4 |
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 | 2 | 2
Interest cost | 2 | 2 | 4 | 4
Expected return on plan assets | (2) | (2) | (4) | (3)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 1 | 0 | 1 | 0
Actuarial loss | (1) | 0 | (1) | 0
Net periodic defined benefit costs (credits) | 1 | 1 | 2 | 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 | 2 | 2 | 4 | 5
Louisville Gas And Electric Co [Member] | Pension Plan [Member] |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 1 | 1 | 1 | 1
Interest cost | 3 | 3 | 6 | 6
Expected return on plan assets | (6) | (6) | (11) | (11)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 2 | 1 | 3 | 2
Actuarial loss | 1 | 1 | $ 3 | $ 4
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 |  |  | $ 1 | $ 1
Net periodic defined benefit costs (credits) | 1 | 0 | 2 | 2
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | U.S. | Qualified Plan [Member] |  |  |  |
Amortization of: [Abstract] |  |  |  |
Settlements |  |  | $ 4 |
Kentucky Utilities Co [Member] |  |  |  |
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |  |
Collective Bargaining Agreement Term |  |  | 3 years |
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 | $ 1 | $ 2 | $ 5

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