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Defined Benefits (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Pension Plan [Member] | U.S. |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | $ 16 | $ 17
Interest cost | 39 | 42
Expected return on plan assets | (62) | (57)
Amortization of: [Abstract] |  |
Prior service cost | 2 | 2
Actuarial loss | 22 | 20
Net periodic defined benefit costs (credits) before settlements and special termination benefits | 17 | 24
Special termination benefits | 0 | 2
Net periodic defined benefit costs (credits) | 17 | 26
Pension Plan [Member] | U.K. |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | 21 | 19
Interest cost | 47 | 43
Expected return on plan assets | (150) | (125)
Amortization of: [Abstract] |  |
Prior service cost | 0 | 0
Actuarial loss | 39 | 35
Net periodic defined benefit costs (credits) before settlements and special termination benefits | (43) | (28)
Special termination benefits | 0 | 0
Net periodic defined benefit costs (credits) | (43) | (28)
Other Postretirement Benefits Plan [Member] |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | 1 | 2
Interest cost | 3 | 6
Expected return on plan assets | (4) | (6)
Amortization of: [Abstract] |  |
Prior service cost | (1) | 0
Net periodic defined benefit costs (credits) | (1) | 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 | 4 | 8
LG And E And KU Energy LLC [Member] | Pension Plan [Member] |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Service cost | 7 | 7
Interest cost | 16 | 16
Expected return on plan assets | (26) | (22)
Amortization of: [Abstract] |  |
Prior service cost | 2 | 2
Actuarial loss | $ 10 | $ 11
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 | $ 4 | $ 5
Net periodic defined benefit costs (credits) | 9 | 14
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) | (1)
Amortization of: [Abstract] |  |
Net periodic defined benefit costs (credits) | 1 | 2
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 | 3
Louisville Gas And Electric Co [Member] | Pension Plan [Member] |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |
Interest cost | 3 | 3
Expected return on plan assets | (5) | (5)
Amortization of: [Abstract] |  |
Prior service cost | 1 | 1
Actuarial loss | $ 2 | $ 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 | $ 1 | $ 1
Net periodic defined benefit costs (credits) | 1 | 2
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 | $ 4

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