Subsequent Events	12 Months Ended
Dec. 31, 2011
PPL Corp [Member]
Subsequent Event [Line Items]
Subsequent Events	25. Subsequent Events (PPL and PPL Energy Supply) In February 2012 PPL announced that its indirect wholly owned subsidiary, PPL Generation, had entered into a definitive agreement (Acquisition Agreement) to acquire from AES Ironwood, Inc. , a subsidiary of The AES Corporation, all of the equity interests of AES Ironwood, L.L.C. and AES Prescott, L.L.C., which together own and operate the 705 MW (winter rating) AES Ironwood combined-cycle natural-gas-fired power plant (Ironwood Facility) located in Lebanon, Pennsylvania. The Ironwood Facility began operation in 2001 and, since July 1, 2008, PPL EnergyPlus has supplied natural gas for the operation of the Ironwood Facility in return for receiving its full electricity output pursuant to a tolling agreement that expires in 2021. The Acquisition Agreement provides for the sale of 100% of the issued and outstanding membership interests (collectively, the "Interests") of each of AES Ironwood, L.L.C. and AES Prescott, L.L.C. (collectively, the "Acquired Companies") to PPL Generation. The consideration payable by PPL Generation in respect of the acquisition is $87 million in cash, which includes approximately $4.8 million of net working capital of the Acquired Companies expected to be received at closing, plus the assumption at closing, through consolidation as a result of acquiring the Interests, of approximately $217 million of net outstanding project indebtedness of AES Ironwood, L.L.C. The outstanding project indebtedness is represented by $308.5 million aggregate principal amount of AES Ironwood, L.L.C. 8.857% senior secured bonds due 2025, the net amount of which expected to be outstanding at closing is approximately $226 million, plus $8 million of debt service reserve loans, less approximately $17 million of restricted cash reserves. The cash purchase price is subject to adjustment based on the amounts by which the actual closing date net working capital and net project indebtedness vary from expected balances. AES Ironwood, Inc. and PPL Generation have each made customary representations, warranties and covenants in the Acquisition Agreement. The transaction is subject to customary closing conditions, including the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, receipt of required regulatory approvals, including approval by the Federal Energy Regulatory Commission under section 203 of the Federal Power Act, and either a reaffirmation of the current ratings of Standard & Poor's Rating Group and Moody's Investors Services, Inc. on the outstanding project indebtedness or consent of the holders of two-thirds of the outstanding project indebtedness. PPL Energy Supply has agreed to guarantee PPL Generation's obligations under the Acquisition Agreement until the cash purchase price has been paid in full, including any post-closing adjustments for net working capital and project indebtedness.
PPL Energy Supply [Member]
Subsequent Event [Line Items]
Subsequent Events	25. Subsequent Events (PPL and PPL Energy Supply) In February 2012 PPL announced that its indirect wholly owned subsidiary, PPL Generation, had entered into a definitive agreement (Acquisition Agreement) to acquire from AES Ironwood, Inc. , a subsidiary of The AES Corporation, all of the equity interests of AES Ironwood, L.L.C. and AES Prescott, L.L.C., which together own and operate the 705 MW (winter rating) AES Ironwood combined-cycle natural-gas-fired power plant (Ironwood Facility) located in Lebanon, Pennsylvania. The Ironwood Facility began operation in 2001 and, since July 1, 2008, PPL EnergyPlus has supplied natural gas for the operation of the Ironwood Facility in return for receiving its full electricity output pursuant to a tolling agreement that expires in 2021. The Acquisition Agreement provides for the sale of 100% of the issued and outstanding membership interests (collectively, the "Interests") of each of AES Ironwood, L.L.C. and AES Prescott, L.L.C. (collectively, the "Acquired Companies") to PPL Generation. The consideration payable by PPL Generation in respect of the acquisition is $87 million in cash, which includes approximately $4.8 million of net working capital of the Acquired Companies expected to be received at closing, plus the assumption at closing, through consolidation as a result of acquiring the Interests, of approximately $217 million of net outstanding project indebtedness of AES Ironwood, L.L.C. The outstanding project indebtedness is represented by $308.5 million aggregate principal amount of AES Ironwood, L.L.C. 8.857% senior secured bonds due 2025, the net amount of which expected to be outstanding at closing is approximately $226 million, plus $8 million of debt service reserve loans, less approximately $17 million of restricted cash reserves. The cash purchase price is subject to adjustment based on the amounts by which the actual closing date net working capital and net project indebtedness vary from expected balances. AES Ironwood, Inc. and PPL Generation have each made customary representations, warranties and covenants in the Acquisition Agreement. The transaction is subject to customary closing conditions, including the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, receipt of required regulatory approvals, including approval by the Federal Energy Regulatory Commission under section 203 of the Federal Power Act, and either a reaffirmation of the current ratings of Standard & Poor's Rating Group and Moody's Investors Services, Inc. on the outstanding project indebtedness or consent of the holders of two-thirds of the outstanding project indebtedness. PPL Energy Supply has agreed to guarantee PPL Generation's obligations under the Acquisition Agreement until the cash purchase price has been paid in full, including any post-closing adjustments for net working capital and project indebtedness.

Subsequent Events

12 Months Ended

Dec. 31, 2011

PPL Corp [Member]

25. Subsequent Events

(PPL and PPL Energy Supply)

In February 2012 PPL announced that its indirect wholly owned subsidiary, PPL Generation, had entered into a definitive agreement (Acquisition Agreement) to acquire from AES Ironwood, Inc. , a subsidiary of The AES Corporation, all of the equity interests of AES Ironwood, L.L.C. and AES Prescott, L.L.C., which together own and operate the 705 MW (winter rating) AES Ironwood combined-cycle natural-gas-fired power plant (Ironwood Facility) located in Lebanon, Pennsylvania. The Ironwood Facility began operation in 2001 and, since July 1, 2008, PPL EnergyPlus has supplied natural gas for the operation of the Ironwood Facility in return for receiving its full electricity output pursuant to a tolling agreement that expires in 2021.

The Acquisition Agreement provides for the sale of 100% of the issued and outstanding membership interests (collectively, the "Interests") of each of AES Ironwood, L.L.C. and AES Prescott, L.L.C. (collectively, the "Acquired Companies") to PPL Generation. The consideration payable by PPL Generation in respect of the acquisition is $87 million in cash, which includes approximately $4.8 million of net working capital of the Acquired Companies expected to be received at closing, plus the assumption at closing, through consolidation as a result of acquiring the Interests, of approximately $217 million of net outstanding project indebtedness of AES Ironwood, L.L.C. The outstanding project indebtedness is represented by $308.5 million aggregate principal amount of AES Ironwood, L.L.C. 8.857% senior secured bonds due 2025, the net amount of which expected to be outstanding at closing is approximately $226 million, plus $8 million of debt service reserve loans, less approximately $17 million of restricted cash reserves. The cash purchase price is subject to adjustment based on the amounts by which the actual closing date net working capital and net project indebtedness vary from expected balances.

AES Ironwood, Inc. and PPL Generation have each made customary representations, warranties and covenants in the Acquisition Agreement. The transaction is subject to customary closing conditions, including the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, receipt of required regulatory approvals, including approval by the Federal Energy Regulatory Commission under section 203 of the Federal Power Act, and either a reaffirmation of the current ratings of Standard & Poor's Rating Group and Moody's Investors Services, Inc. on the outstanding project indebtedness or consent of the holders of two-thirds of the outstanding project indebtedness.

PPL Energy Supply has agreed to guarantee PPL Generation's obligations under the Acquisition Agreement until the cash purchase price has been paid in full, including any post-closing adjustments for net working capital and project indebtedness.

PPL Energy Supply [Member]

Subsequent Event [Line Items]

Subsequent Events

25. Subsequent Events

(PPL and PPL Energy Supply)

- Definition

Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business.

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