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Defined Benefits (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Pension Plan [Member] | U.S. |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | $ 17 | $ 16 | $ 49 | $ 49
Interest cost | 42 | 44 | 126 | 131
Expected return on plan assets | (58) | (57) | (173) | (171)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 2 | 2 | 7 | 6
Actuarial loss | 18 | 12 | 52 | 37
Net periodic defined benefit costs (credits) before settlements and special termination benefits | 21 | 17 | 61 | 52
Settlements | 7 | 3 | 7 | 3
Special termination benefits | 0 | 0 | 1 | 0
Net periodic defined benefit costs (credits) | 28 | 20 | 69 | 55
Pension Plan [Member] | U.S. | Nonqualified Plan [Member] |  |  |  |
Amortization of: [Abstract] |  |  |  |
Settlements | 2 | 3 | 2 | 3
Pension Plan [Member] | U.S. | LGE [Member] | Qualified Plan [Member] |  |  |  |
Amortization of: [Abstract] |  |  |  |
Settlements | 5 |  | 5 |
Pension Plan [Member] | U.K. |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 20 | 17 | 57 | 53
Interest cost | 45 | 58 | 132 | 182
Expected return on plan assets | (130) | (124) | (382) | (389)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 0 | 0 | 0 | 0
Actuarial loss | 36 | 34 | 107 | 107
Net periodic defined benefit costs (credits) before settlements and special termination benefits | (29) | (15) | (86) | (47)
Settlements | 0 | 0 | 0 | 0
Special termination benefits | 0 | 0 | 0 | 0
Net periodic defined benefit costs (credits) | (29) | (15) | (86) | (47)
Net Periodic Defined Benefit Costs Allocated to Subsidiary by Sponsor (Numeric) [Abstract] |  |  |  |
Employer contributions |  |  | 485 |
Other Postretirement Benefits Plan [Member] |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 2 | 2 | 6 | 6
Interest cost | 5 | 6 | 17 | 19
Expected return on plan assets | (6) | (6) | (17) | (17)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 0 | 0 | (1) | 0
Actuarial loss | 1 | 1 | 1 | 1
Net periodic defined benefit costs (credits) | 2 | 3 | 6 | 9
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 | 6 | 6 | 19 | 17
LG And E And KU Energy LLC [Member] | Pension Plan [Member] |  |  |  |
Net Periodic Defined Benefit Costs (Credits) (Details) [Abstract] |  |  |  |
Service cost | 6 | 6 | 18 | 18
Interest cost | 17 | 18 | 51 | 53
Expected return on plan assets | (23) | (23) | (69) | (68)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 2 | 2 | 6 | 6
Actuarial loss | 8 | 5 | 23 | 15
Net periodic defined benefit costs before settlements | 10 | 8 | 29 | 24
Settlements | $ 5 | 0 | $ 5 | $ 0
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 | $ 3 |  | $ 8 | $ 4
Net periodic defined benefit costs (credits) | 15 | 8 | 34 | 24
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 | 7
Expected return on plan assets | (2) | (2) | (5) | (5)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 1 | 1 | 1 | 2
Net periodic defined benefit costs (credits) | 2 | 2 | 5 | 7
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 | 2 | 8 | 7
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 | 3 | 4 | 9 | 11
Expected return on plan assets | (5) | (5) | (16) | (15)
Amortization of: [Abstract] |  |  |  |
Prior service cost | 1 | 1 | 3 | 3
Actuarial loss | 3 | 2 | 7 | 5
Net periodic defined benefit costs before settlements | 2 | 2 | 4 | 5
Settlements | $ 5 | $ 0 | $ 5 | 0
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 | $ 1 | $ 1 | $ 3 |
Net periodic defined benefit costs (credits) | 7 | 2 | 9 | 5
Louisville Gas And Electric Co [Member] | Pension Plan [Member] | Qualified Plan [Member] |  |  |  |
Amortization of: [Abstract] |  |  |  |
Settlements |  |  | 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 | $ 2 | $ 2 | $ 7 | $ 8

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