Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2012

Summary of Significant Accounting Policies [Line Items]

Accounts Receivable

Accounts Receivable (PPL, PPL Energy Supply and PPL Electric)

PPL Electric's customers may choose an alternative supplier for their generation supply. In accordance with a PUC-approved purchase of accounts receivable program, PPL Electric continues to purchase certain accounts receivable from alternative suppliers at a nominal discount, which reflects a provision for uncollectible accounts. The alternative suppliers (including PPL Electric's affiliate, PPLEnergyPlus) have no continuing involvement or interest in the purchased accounts receivable. The purchased accounts receivable are initially recorded at fair value using a market approach based on the purchase price paid and are classified as Level 2 in the fair value hierarchy. PPL Electric receives a nominal fee for administering its program. During the three and nine months endedSeptember 30, 2012, PPL Electric purchased $225million and $647 million of accounts receivable from unaffiliated third parties and $81million and $237 million from its affiliate, PPL EnergyPlus. During the three and nine months ended September 30, 2011, PPL Electric purchased $222 million and $674million of accounts receivable from unaffiliated third parties and$71 million and $191 million from its affiliate, PPL EnergyPlus.

PPL Electric Utilities Corp [Member]

Summary of Significant Accounting Policies [Line Items]

Accounts Receivable

Accounts Receivable (PPL, PPL Energy Supply and PPL Electric)

PPL Electric's customers may choose an alternative supplier for their generation supply. In accordance with a PUC-approved purchase of accounts receivable program, PPL Electric continues to purchase certain accounts receivable from alternative suppliers at a nominal discount, which reflects a provision for uncollectible accounts. The alternative suppliers (including PPL Electric's affiliate, PPLEnergyPlus) have no continuing involvement or interest in the purchased accounts receivable. The purchased accounts receivable are initially recorded at fair value using a market approach based on the purchase price paid and are classified as Level 2 in the fair value hierarchy. PPL Electric receives a nominal fee for administering its program. During the three and nine months endedSeptember 30, 2012, PPL Electric purchased $225million and $647 million of accounts receivable from unaffiliated third parties and $81million and $237 million from its affiliate, PPL EnergyPlus. During the three and nine months ended September 30, 2011, PPL Electric purchased $222 million and $674million of accounts receivable from unaffiliated third parties and$71 million and $191 million from its affiliate, PPL EnergyPlus.

PPL Energy Supply LLC [Member]

Summary of Significant Accounting Policies [Line Items]

Accounts Receivable

Accounts Receivable (PPL, PPL Energy Supply and PPL Electric)

PPL Electric's customers may choose an alternative supplier for their generation supply. In accordance with a PUC-approved purchase of accounts receivable program, PPL Electric continues to purchase certain accounts receivable from alternative suppliers at a nominal discount, which reflects a provision for uncollectible accounts. The alternative suppliers (including PPL Electric's affiliate, PPLEnergyPlus) have no continuing involvement or interest in the purchased accounts receivable. The purchased accounts receivable are initially recorded at fair value using a market approach based on the purchase price paid and are classified as Level 2 in the fair value hierarchy. PPL Electric receives a nominal fee for administering its program. During the three and nine months endedSeptember 30, 2012, PPL Electric purchased $225million and $647 million of accounts receivable from unaffiliated third parties and $81million and $237 million from its affiliate, PPL EnergyPlus. During the three and nine months ended September 30, 2011, PPL Electric purchased $222 million and $674million of accounts receivable from unaffiliated third parties and$71 million and $191 million from its affiliate, PPL EnergyPlus.