SCHEDULE I - NOTES TO CONDENSED UNCONSOLIDATED FINANCIAL STATEMENTS (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015
Aggregate maturities of long-term debt (Details) [Abstract]
2020		$ 1,262
2021		1,150
Principal outstanding		18,399	$ 19,171
LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]
Condensed Unconsolidated Financial Statements [Line Items]
Maximum exposure	[1]	$ 301
Term of guarantee (in years)		12 years
Expiration date minimum		2021
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
Expiration date maximum		2023
PPL Corp [Member] | PPL Guarantee [Member] | Financial Guarantee [Member] | Guarantee Of Principal And Premium And Interest [Member]
Condensed Unconsolidated Financial Statements [Line Items]
Maximum exposure		$ 8,600
Expiration date		2073
L G And E And K U Energy L L C Unconsolidated [Member] | Senior Unsecured Notes [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
2020		$ 475
2021		250
L G And E And K U Energy L L C Unconsolidated [Member] | Note Payable [Member] | PPL [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Principal outstanding		$ 400
Maturity date (in years)		Dec. 31, 2025
L G And E And K U Energy L L C Unconsolidated [Member] | Note Payable [Member] | L G And E And K U Services Company [Member]
Aggregate maturities of long-term debt (Details) [Abstract]
Principal outstanding		$ 80
Maturity date (in years)		Dec. 31, 2019
Stated interest rate		1.381%
L G And E And K U Energy L L C Unconsolidated [Member] | LKE Guarantee [Member] | Indemnification Guarantee [Member] | Indemnification Of Lease Termination And Other Divestitures [Member]
Condensed Unconsolidated Financial Statements [Line Items]
Term of guarantee (in years)		12
Expiration date minimum		2021
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
Expiration date maximum		2023

[1] LKE provides certain indemnifications covering the due and punctual payment, performance and discharge by each party of its respective obligations. The most comprehensive of these guarantees is the LKE guarantee covering operational, regulatory and environmental commitments and indemnifications made by WKE under a 2009 Transaction Termination Agreement. This guarantee has a term of 12 years ending July 2021, and a maximum exposure of $200 million, exclusive of certain items such as government fines and penalties that may exceed the maximum. Another WKE-related LKE guarantee covers other indemnifications related to the purchase price of excess power, has a term expiring in 2023, and a maximum exposure of $100 million. In May 2012, LKE's indemnitee received an unfavorable arbitration panel's decision interpreting this matter. In October 2014, LKE's indemnitee filed a motion for discretionary review with the Kentucky Supreme Court seeking to overturn the arbitration decision, and such motion was denied by the court in September 2015. In September 2015, the counterparty issued a demand letter to LKE's indemnitee. In February 2016, the counterparty filed a complaint in Henderson, Kentucky Circuit Court, seeking an award of damages in the matter. The proceeding is currently in the discovery phase. LKE does not believe appropriate contractual, legal or commercial grounds exist for the claim made. LKE believes its indemnification obligations in the WKE matter remain subject to various uncertainties, including additional legal and contractual developments, as well as future prices, availability and demand for the subject excess power. Although the parties have also conducted certain settlement discussions, the ultimate outcomes of the WKE termination-related indemnifications cannot be predicted at this time. Additionally, LKE has indemnified various third parties related to historical obligations for other divested subsidiaries and affiliates. The indemnifications vary by entity and the maximum exposures range from being capped at the sale price to no specified maximum. LKE could be required to perform on these indemnifications in the event of covered losses or liabilities being claimed by an indemnified party. LKE cannot predict the ultimate outcomes of the various indemnification scenarios, but does not expect such outcomes to result in significant losses above the amounts recorded.