Commitments and Contingencies - Guarantees and Other Assurances (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Guarantor Obligations [Line Items]
Recorded liability for all guarantees	$ 22	$ 22
Other Guarantee (Numeric) [Abstract]
Maximum aggregate coverage bodily injury and property damage	$ 225
PPL Guarantee [Member] \| Indemnification Guarantee [Member] \| Indemnifications Related To WPD Midlands Acquisition [Member]
Guarantor Obligations [Line Items]
Maximum exposure inestimable	The maximum exposure and expiration of these indemnifications cannot be estimated because the maximum potential liability is not capped and the expiration date is not specified in the transaction documents.
PPL Guarantee [Member] \| Indemnification Guarantee [Member] \| Indemnifications For Entities In Liquidation Sales Of Assets [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 10
Expiration date	2019
PPL Guarantee [Member] \| Indemnification Guarantee [Member] \| Indemnifications For Entities In Liquidation Sales Of Assets [Member] \| Minimum [Member]
Guarantor Obligations [Line Items]
Period that indemnifications generally expire (in years)	2 years
PPL Guarantee [Member] \| Indemnification Guarantee [Member] \| Indemnifications For Entities In Liquidation Sales Of Assets [Member] \| Maximum [Member]
Guarantor Obligations [Line Items]
Period that indemnifications generally expire (in years)	7 years
PPL Guarantee [Member] \| Financial Guarantee [Member] \| WPD Guarantee Of Pension And Other Obligations Of Unconsolidated Entities [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 105
PPL Electric Guarantee [Member] \| Indemnification Guarantee [Member] \| Guarantee Of Inventory Value [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 17
Expiration date	2018
LKE Guarantee [Member] \| Indemnification Guarantee [Member] \| Indemnification Of Lease Termination And Other Divestitures [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 301
Term of guarantee (in years)	12
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues	$ 200
Maximum exposure of other guarantees expiring related to a terminated lease	$ 100
LKE Guarantee [Member] \| Indemnification Guarantee [Member] \| Indemnification Of Lease Termination And Other Divestitures [Member] \| Minimum [Member]
Guarantor Obligations [Line Items]
Expiration date	2021
LKE Guarantee [Member] \| Indemnification Guarantee [Member] \| Indemnification Of Lease Termination And Other Divestitures [Member] \| Maximum [Member]
Guarantor Obligations [Line Items]
Expiration date	2023
LGE And KU Guarantee [Member] \| Financial Guarantee [Member] \| LGE And KU Guarantee Of Shortfall Related To OVEC [Member]
Guarantor Obligations [Line Items]
Maximum exposure inestimable	The maximum exposure and the expiration date of these potential obligations are not presently determinable.
Contingent proportionate share of OVEC's outstanding debt	$ 120
PPL Electric Utilities Corp [Member] \| Indemnification Guarantee [Member] \| Guarantee Of Inventory Value [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 17
Expiration date	2018
LG And E And KU Energy LLC [Member]
Guarantor Obligations [Line Items]
Recorded liability for all guarantees	$ 17	$ 17
LG And E And KU Energy LLC [Member] \| Indemnification Guarantee [Member] \| Indemnification Of Lease Termination And Other Divestitures [Member]
Guarantor Obligations [Line Items]
Maximum exposure	$ 301
Term of guarantee (in years)	12
Maximum exposure of guarantee related to terminated lease specific to operational, regulatory and environmental issues	$ 200
Maximum exposure of other guarantees expiring related to a terminated lease	$ 100
LG And E And KU Energy LLC [Member] \| Indemnification Guarantee [Member] \| Indemnification Of Lease Termination And Other Divestitures [Member] \| Minimum [Member]
Guarantor Obligations [Line Items]
Expiration date	2021
LG And E And KU Energy LLC [Member] \| Indemnification Guarantee [Member] \| Indemnification Of Lease Termination And Other Divestitures [Member] \| Maximum [Member]
Guarantor Obligations [Line Items]
Expiration date	2023
LG And E And KU Energy LLC [Member] \| Financial Guarantee [Member] \| LGE And KU Guarantee Of Shortfall Related To OVEC [Member]
Guarantor Obligations [Line Items]
Maximum exposure inestimable	The maximum exposure and the expiration date of these potential obligations are not presently determinable.
Contingent proportionate share of OVEC's outstanding debt	$ 120
Louisville Gas And Electric Co [Member] \| Financial Guarantee [Member] \| LGE And KU Guarantee Of Shortfall Related To OVEC [Member]
Guarantor Obligations [Line Items]
Maximum exposure inestimable	The maximum exposure and the expiration date of these potential obligations are not presently determinable.
Contingent proportionate share of OVEC's outstanding debt	$ 83
Kentucky Utilities Co [Member] \| Financial Guarantee [Member] \| LGE And KU Guarantee Of Shortfall Related To OVEC [Member]
Guarantor Obligations [Line Items]
Maximum exposure inestimable	The maximum exposure and the expiration date of these potential obligations are not presently determinable.
Contingent proportionate share of OVEC's outstanding debt	$ 37

Commitments and Contingencies - Guarantees and Other Assurances (Details) - USD ($)
$ in Millions

3 Months Ended

Mar. 31, 2017

Dec. 31, 2016

Guarantor Obligations [Line Items]

Recorded liability for all guarantees

$ 22

Other Guarantee (Numeric) [Abstract]

Maximum aggregate coverage bodily injury and property damage

$ 225

PPL Guarantee [Member] | Indemnification Guarantee [Member] | Indemnifications Related To WPD Midlands Acquisition [Member]

Guarantor Obligations [Line Items]

Maximum exposure inestimable

The maximum exposure and expiration of these indemnifications cannot be estimated because the maximum potential liability is not capped and the expiration date is not specified in the transaction documents.