Variable Interest Entities	12 Months Ended
Dec. 31, 2012
Variable Interest Entities [Line Items]
Variable Interest Entities	22. Variable Interest Entities (PPL and PPL Energy Supply) In December 2001, a subsidiary of PPL Energy Supply entered into a $455 million operating lease arrangement, as lessee, for the development, construction and operation of a gas-fired combined-cycle generation facility located in Lower Mt. Bethel Township, Northampton County, Pennsylvania. The owner/lessor of this generation facility, LMB Funding, LP, was created to own/lease the facility and incur the related financing costs. The initial lease term commenced on the date of commercial operation, which occurred in May 2004, and ends in December 2013. Under a residual value guarantee, if the generation facility is sold at the end of the lease term and the cash proceeds from the sale are less than the original acquisition cost, the subsidiary of PPL Energy Supply is obligated to pay up to 70.52% of the original acquisition cost. This residual value guarantee protects the other variable interest holders from losses related to their investments. LMB Funding, LP cannot extend or cancel the lease or sell the facility without the prior consent of the PPL Energy Supply subsidiary. As a result, LMB Funding, LP was determined to be a VIE and the subsidiary of PPL Energy Supply was considered the primary beneficiary that consolidates this VIE. The lease financing, which includes $437 million of debt and $18 million of "Noncontrolling interests" at December 31, 2012 and December 31, 2011, is secured by, among other things, the generation facility, the carrying amount of which is disclosed on the Balance Sheets. The debt matures in December 2013, the end of the initial lease term, and therefore has been classified in "Long-term debt due within one year" at December 31, 2012. As a result of the consolidation, PPL Energy Supply has recorded interest expense in lieu of rent expense. For 2012, 2011 and 2010, additional depreciation on the generation facility of $16 million was recorded each year.
PPL Energy Supply LLC [Member]
Variable Interest Entities [Line Items]
Variable Interest Entities	22. Variable Interest Entities (PPL and PPL Energy Supply) In December 2001, a subsidiary of PPL Energy Supply entered into a $455 million operating lease arrangement, as lessee, for the development, construction and operation of a gas-fired combined-cycle generation facility located in Lower Mt. Bethel Township, Northampton County, Pennsylvania. The owner/lessor of this generation facility, LMB Funding, LP, was created to own/lease the facility and incur the related financing costs. The initial lease term commenced on the date of commercial operation, which occurred in May 2004, and ends in December 2013. Under a residual value guarantee, if the generation facility is sold at the end of the lease term and the cash proceeds from the sale are less than the original acquisition cost, the subsidiary of PPL Energy Supply is obligated to pay up to 70.52% of the original acquisition cost. This residual value guarantee protects the other variable interest holders from losses related to their investments. LMB Funding, LP cannot extend or cancel the lease or sell the facility without the prior consent of the PPL Energy Supply subsidiary. As a result, LMB Funding, LP was determined to be a VIE and the subsidiary of PPL Energy Supply was considered the primary beneficiary that consolidates this VIE. The lease financing, which includes $437 million of debt and $18 million of "Noncontrolling interests" at December 31, 2012 and December 31, 2011, is secured by, among other things, the generation facility, the carrying amount of which is disclosed on the Balance Sheets. The debt matures in December 2013, the end of the initial lease term, and therefore has been classified in "Long-term debt due within one year" at December 31, 2012. As a result of the consolidation, PPL Energy Supply has recorded interest expense in lieu of rent expense. For 2012, 2011 and 2010, additional depreciation on the generation facility of $16 million was recorded each year.

Variable Interest Entities

12 Months Ended

Dec. 31, 2012

Variable Interest Entities [Line Items]

22. Variable Interest Entities

(PPL and PPL Energy Supply)

In December 2001, a subsidiary of PPL Energy Supply entered into a $455 million operating lease arrangement, as lessee, for the development, construction and operation of a gas-fired combined-cycle generation facility located in Lower Mt. Bethel Township, Northampton County, Pennsylvania. The owner/lessor of this generation facility, LMB Funding, LP, was created to own/lease the facility and incur the related financing costs. The initial lease term commenced on the date of commercial operation, which occurred in May 2004, and ends in December 2013. Under a residual value guarantee, if the generation facility is sold at the end of the lease term and the cash proceeds from the sale are less than the original acquisition cost, the subsidiary of PPL Energy Supply is obligated to pay up to 70.52% of the original acquisition cost. This residual value guarantee protects the other variable interest holders from losses related to their investments. LMB Funding, LP cannot extend or cancel the lease or sell the facility without the prior consent of the PPL Energy Supply subsidiary. As a result, LMB Funding, LP was determined to be a VIE and the subsidiary of PPL Energy Supply was considered the primary beneficiary that consolidates this VIE.

The lease financing, which includes $437 million of debt and $18 million of "Noncontrolling interests" at December 31, 2012 and December 31, 2011, is secured by, among other things, the generation facility, the carrying amount of which is disclosed on the Balance Sheets. The debt matures in December 2013, the end of the initial lease term, and therefore has been classified in "Long-term debt due within one year" at December 31, 2012. As a result of the consolidation, PPL Energy Supply has recorded interest expense in lieu of rent expense. For 2012, 2011 and 2010, additional depreciation on the generation facility of $16 million was recorded each year.

PPL Energy Supply LLC [Member]

Variable Interest Entities [Line Items]

Variable Interest Entities

22. Variable Interest Entities

(PPL and PPL Energy Supply)