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SCHEDULE I - NOTES TO CONDENSED UNCONSOLIDATED FINANCIAL STATEMENTS (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Aggregate maturities of long-term debt (Details) [Abstract]    
2020 $ 1,301  
Principal outstanding 19,171 $ 18,188
New Accounting Pronouncement Early Adoption [Member]    
Condensed Unconsolidated Financial Statements [Line Items]    
Deferred tax assets   125
Deferred tax liabilities   0
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  
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] | New Accounting Pronouncement Early Adoption [Member]    
Condensed Unconsolidated Financial Statements [Line Items]    
Deferred tax assets   34
Deferred tax liabilities   5
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 $ 8,400  
Expiration date 2073  
LG&E and KU Energy LLC Unconsolidated | New Accounting Pronouncement Early Adoption [Member]    
Condensed Unconsolidated Financial Statements [Line Items]    
Deferred tax assets   2
Debt issuance costs reclassed from other noncurrent assets to long-term debt   $ 4
LG&E and KU Energy LLC Unconsolidated | Senior Unsecured Notes [Member]    
Aggregate maturities of long-term debt (Details) [Abstract]    
2020 $ 475  
2021 250  
LG&E and KU Energy LLC Unconsolidated | Note Payable [Member] | PPL [Member]    
Aggregate maturities of long-term debt (Details) [Abstract]    
Principal outstanding $ 400  
Maturity date (in years) Dec. 31, 2025  
LG&E and KU Energy LLC Unconsolidated | Note Payable [Member] | LGE [Member]    
Aggregate maturities of long-term debt (Details) [Abstract]    
Principal outstanding $ 100  
Maturity date (in years) Dec. 31, 2019  
Stated interest rate 1.068%  
LG&E and KU Energy LLC Unconsolidated | Note Payable [Member] | KU [Member]    
Aggregate maturities of long-term debt (Details) [Abstract]    
Principal outstanding $ 100  
Maturity date (in years) Dec. 31, 2019  
Stated interest rate 1.068%  
LG&E and KU Energy LLC Unconsolidated | 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 fall outside the cap. Another WKE-related LKE guarantee covers other indemnifications related to the p urchase 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 Oct ober 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. LKE does not believe appropriate contractual, legal or commercial grounds exist for the claim s made and has disputed the demand s . LKE believes its indemnification obligations in the WKE matter remain subject to various uncertain ties, including additional legal and contractual developments, as well as future prices, availability and demand for the subject excess power. The parties are conducting preliminary settlement discussions, however, the ultimate outcomes of the WKE termina tion-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 ou tcomes of the indemnification circumstances, but does not currently expect such outcomes to result in significant losses above the amounts recorded.