Preferred Securities	12 Months Ended
Dec. 31, 2012
Preferred Securities [Line Items]
Preferred Securities	3. Preferred Securities (PPL) PPL classifies preferred securities of subsidiaries as "Noncontrolling interests" on the Balance Sheets and related dividend requirements of $4 million for 2012, $16 million for 2011 and $17 million for 2010 have been included in "Net Income Attributable to Noncontrolling Interests" on the Statements of Income. In June 2012, PPL Electric redeemed all of its Preference Stock at par value, without premium ($250 million in the aggregate). Preferred Stock PPL is authorized to issue up to 10 million shares of preferred stock. No PPL preferred stock was issued or outstanding in 2012, 2011, or 2010. (PPL Electric) PPL Electric is authorized to issue up to 629,936 shares of 4-1/2% Preferred Stock and 10 million shares of series preferred stock. In April 2010, PPL Electric redeemed all of its outstanding preferred stock (247,524 shares of 4-1/2% Preferred Stock and 257,665 shares of four series of preferred stock), with a par value in the aggregate of $51 million, for $54 million including accumulated dividends. (LG&E) LG&E is authorized to issue up to 1,720,000 shares of preferred stock at a $25 par value and 6,750,000 shares of preferred stock without par value. LG&E had no preferred stock issued or outstanding in 2012, 2011 or 2010. (KU) KU is authorized to issue up to 5,300,000 shares of preferred stock without par value. KU had no preferred stock issued or outstanding in 2012, 2011 or 2010. Preference Stock (PPL Electric) PPL Electric is authorized to issue up to 10 million shares of Preference Stock and had 2.5 million shares of 6.25% Series Preference Stock (Preference Shares) issued and outstanding at December 31, 2011 and 2010. In June 2012, PPL Electric redeemed all 2.5 million shares of its outstanding Preference Shares, par value of $100 per share. The price paid for the redemption was the par value, without premium ($250 million in the aggregate). The Preference Shares were held by a bank that acted as depositary for 10 million depositary shares, each of which represented a one-quarter interest in a Preference Share. Holders of the depositary shares were entitled to all proportional rights and preferences of the Preference Shares, including dividend, voting, redemption and liquidation rights, exercised through the bank acting as a depositary. The Preference Shares ranked senior to PPL Electric's common stock but had no voting rights, except as provided by law, and they had a liquidation preference of $100 per share (equivalent to $25 per depositary share). (KU) KU is authorized to issue up to 2,000,000 shares of preference stock without par value. KU had no preference stock issued or outstanding in 2012, 2011 or 2010.
PPL Electric Utilities Corp [Member]
Preferred Securities [Line Items]
Preferred Securities	3. Preferred Securities (PPL) PPL classifies preferred securities of subsidiaries as "Noncontrolling interests" on the Balance Sheets and related dividend requirements of $4 million for 2012, $16 million for 2011 and $17 million for 2010 have been included in "Net Income Attributable to Noncontrolling Interests" on the Statements of Income. In June 2012, PPL Electric redeemed all of its Preference Stock at par value, without premium ($250 million in the aggregate). Preferred Stock PPL is authorized to issue up to 10 million shares of preferred stock. No PPL preferred stock was issued or outstanding in 2012, 2011, or 2010. (PPL Electric) PPL Electric is authorized to issue up to 629,936 shares of 4-1/2% Preferred Stock and 10 million shares of series preferred stock. In April 2010, PPL Electric redeemed all of its outstanding preferred stock (247,524 shares of 4-1/2% Preferred Stock and 257,665 shares of four series of preferred stock), with a par value in the aggregate of $51 million, for $54 million including accumulated dividends. (LG&E) LG&E is authorized to issue up to 1,720,000 shares of preferred stock at a $25 par value and 6,750,000 shares of preferred stock without par value. LG&E had no preferred stock issued or outstanding in 2012, 2011 or 2010. (KU) KU is authorized to issue up to 5,300,000 shares of preferred stock without par value. KU had no preferred stock issued or outstanding in 2012, 2011 or 2010. Preference Stock (PPL Electric) PPL Electric is authorized to issue up to 10 million shares of Preference Stock and had 2.5 million shares of 6.25% Series Preference Stock (Preference Shares) issued and outstanding at December 31, 2011 and 2010. In June 2012, PPL Electric redeemed all 2.5 million shares of its outstanding Preference Shares, par value of $100 per share. The price paid for the redemption was the par value, without premium ($250 million in the aggregate). The Preference Shares were held by a bank that acted as depositary for 10 million depositary shares, each of which represented a one-quarter interest in a Preference Share. Holders of the depositary shares were entitled to all proportional rights and preferences of the Preference Shares, including dividend, voting, redemption and liquidation rights, exercised through the bank acting as a depositary. The Preference Shares ranked senior to PPL Electric's common stock but had no voting rights, except as provided by law, and they had a liquidation preference of $100 per share (equivalent to $25 per depositary share). (KU) KU is authorized to issue up to 2,000,000 shares of preference stock without par value. KU had no preference stock issued or outstanding in 2012, 2011 or 2010.
Louisville Gas And Electric Co [Member]
Preferred Securities [Line Items]
Preferred Securities	3. Preferred Securities (PPL) PPL classifies preferred securities of subsidiaries as "Noncontrolling interests" on the Balance Sheets and related dividend requirements of $4 million for 2012, $16 million for 2011 and $17 million for 2010 have been included in "Net Income Attributable to Noncontrolling Interests" on the Statements of Income. In June 2012, PPL Electric redeemed all of its Preference Stock at par value, without premium ($250 million in the aggregate). Preferred Stock PPL is authorized to issue up to 10 million shares of preferred stock. No PPL preferred stock was issued or outstanding in 2012, 2011, or 2010. (PPL Electric) PPL Electric is authorized to issue up to 629,936 shares of 4-1/2% Preferred Stock and 10 million shares of series preferred stock. In April 2010, PPL Electric redeemed all of its outstanding preferred stock (247,524 shares of 4-1/2% Preferred Stock and 257,665 shares of four series of preferred stock), with a par value in the aggregate of $51 million, for $54 million including accumulated dividends. (LG&E) LG&E is authorized to issue up to 1,720,000 shares of preferred stock at a $25 par value and 6,750,000 shares of preferred stock without par value. LG&E had no preferred stock issued or outstanding in 2012, 2011 or 2010. (KU) KU is authorized to issue up to 5,300,000 shares of preferred stock without par value. KU had no preferred stock issued or outstanding in 2012, 2011 or 2010. Preference Stock (PPL Electric) PPL Electric is authorized to issue up to 10 million shares of Preference Stock and had 2.5 million shares of 6.25% Series Preference Stock (Preference Shares) issued and outstanding at December 31, 2011 and 2010. In June 2012, PPL Electric redeemed all 2.5 million shares of its outstanding Preference Shares, par value of $100 per share. The price paid for the redemption was the par value, without premium ($250 million in the aggregate). The Preference Shares were held by a bank that acted as depositary for 10 million depositary shares, each of which represented a one-quarter interest in a Preference Share. Holders of the depositary shares were entitled to all proportional rights and preferences of the Preference Shares, including dividend, voting, redemption and liquidation rights, exercised through the bank acting as a depositary. The Preference Shares ranked senior to PPL Electric's common stock but had no voting rights, except as provided by law, and they had a liquidation preference of $100 per share (equivalent to $25 per depositary share). (KU) KU is authorized to issue up to 2,000,000 shares of preference stock without par value. KU had no preference stock issued or outstanding in 2012, 2011 or 2010.
Kentucky Utilities Co [Member]
Preferred Securities [Line Items]
Preferred Securities	3. Preferred Securities (PPL) PPL classifies preferred securities of subsidiaries as "Noncontrolling interests" on the Balance Sheets and related dividend requirements of $4 million for 2012, $16 million for 2011 and $17 million for 2010 have been included in "Net Income Attributable to Noncontrolling Interests" on the Statements of Income. In June 2012, PPL Electric redeemed all of its Preference Stock at par value, without premium ($250 million in the aggregate). Preferred Stock PPL is authorized to issue up to 10 million shares of preferred stock. No PPL preferred stock was issued or outstanding in 2012, 2011, or 2010. (PPL Electric) PPL Electric is authorized to issue up to 629,936 shares of 4-1/2% Preferred Stock and 10 million shares of series preferred stock. In April 2010, PPL Electric redeemed all of its outstanding preferred stock (247,524 shares of 4-1/2% Preferred Stock and 257,665 shares of four series of preferred stock), with a par value in the aggregate of $51 million, for $54 million including accumulated dividends. (LG&E) LG&E is authorized to issue up to 1,720,000 shares of preferred stock at a $25 par value and 6,750,000 shares of preferred stock without par value. LG&E had no preferred stock issued or outstanding in 2012, 2011 or 2010. (KU) KU is authorized to issue up to 5,300,000 shares of preferred stock without par value. KU had no preferred stock issued or outstanding in 2012, 2011 or 2010. Preference Stock (PPL Electric) PPL Electric is authorized to issue up to 10 million shares of Preference Stock and had 2.5 million shares of 6.25% Series Preference Stock (Preference Shares) issued and outstanding at December 31, 2011 and 2010. In June 2012, PPL Electric redeemed all 2.5 million shares of its outstanding Preference Shares, par value of $100 per share. The price paid for the redemption was the par value, without premium ($250 million in the aggregate). The Preference Shares were held by a bank that acted as depositary for 10 million depositary shares, each of which represented a one-quarter interest in a Preference Share. Holders of the depositary shares were entitled to all proportional rights and preferences of the Preference Shares, including dividend, voting, redemption and liquidation rights, exercised through the bank acting as a depositary. The Preference Shares ranked senior to PPL Electric's common stock but had no voting rights, except as provided by law, and they had a liquidation preference of $100 per share (equivalent to $25 per depositary share). (KU) KU is authorized to issue up to 2,000,000 shares of preference stock without par value. KU had no preference stock issued or outstanding in 2012, 2011 or 2010.

3. Preferred Securities

(PPL)

PPL classifies preferred securities of subsidiaries as "Noncontrolling interests" on the Balance Sheets and related dividend requirements of $4 million for 2012, $16 million for 2011 and $17 million for 2010 have been included in "Net Income Attributable to Noncontrolling Interests" on the Statements of Income. In June 2012, PPL Electric redeemed all of its Preference Stock at par value, without premium ($250 million in the aggregate).

Preferred Stock

PPL is authorized to issue up to 10 million shares of preferred stock. No PPL preferred stock was issued or outstanding in 2012, 2011, or 2010.

(PPL Electric)

PPL Electric is authorized to issue up to 629,936 shares of 4-1/2% Preferred Stock and 10 million shares of series preferred stock. In April 2010, PPL Electric redeemed all of its outstanding preferred stock (247,524 shares of 4-1/2% Preferred Stock and 257,665 shares of four series of preferred stock), with a par value in the aggregate of $51 million, for $54 million including accumulated dividends.

(LG&E)

LG&E is authorized to issue up to 1,720,000 shares of preferred stock at a $25 par value and 6,750,000 shares of preferred stock without par value. LG&E had no preferred stock issued or outstanding in 2012, 2011 or 2010.

(KU)

KU is authorized to issue up to 5,300,000 shares of preferred stock without par value. KU had no preferred stock issued or outstanding in 2012, 2011 or 2010.

Preference Stock

(PPL Electric)

PPL Electric is authorized to issue up to 10 million shares of Preference Stock and had 2.5 million shares of 6.25% Series Preference Stock (Preference Shares) issued and outstanding at December 31, 2011 and 2010. In June 2012, PPL Electric redeemed all 2.5 million shares of its outstanding Preference Shares, par value of $100 per share. The price paid for the redemption was the par value, without premium ($250 million in the aggregate).

The Preference Shares were held by a bank that acted as depositary for 10 million depositary shares, each of which represented a one-quarter interest in a Preference Share. Holders of the depositary shares were entitled to all proportional rights and preferences of the Preference Shares, including dividend, voting, redemption and liquidation rights, exercised through the bank acting as a depositary. The Preference Shares ranked senior to PPL Electric's common stock but had no voting rights, except as provided by law, and they had a liquidation preference of $100 per share (equivalent to $25 per depositary share).

(KU)

KU is authorized to issue up to 2,000,000 shares of preference stock without par value. KU had no preference stock issued or outstanding in 2012, 2011 or 2010.

Preferred Securities [Line Items]

Preferred Securities

3. Preferred Securities

(PPL)

PPL classifies preferred securities of subsidiaries as "Noncontrolling interests" on the Balance Sheets and related dividend requirements of $4 million for 2012, $16 million for 2011 and $17 million for 2010 have been included in "Net Income Attributable to Noncontrolling Interests" on the Statements of Income. In June 2012, PPL Electric redeemed all of its Preference Stock at par value, without premium ($250 million in the aggregate).

Preferred Stock

PPL is authorized to issue up to 10 million shares of preferred stock. No PPL preferred stock was issued or outstanding in 2012, 2011, or 2010.

(PPL Electric)

PPL Electric is authorized to issue up to 629,936 shares of 4-1/2% Preferred Stock and 10 million shares of series preferred stock. In April 2010, PPL Electric redeemed all of its outstanding preferred stock (247,524 shares of 4-1/2% Preferred Stock and 257,665 shares of four series of preferred stock), with a par value in the aggregate of $51 million, for $54 million including accumulated dividends.

(LG&E)

LG&E is authorized to issue up to 1,720,000 shares of preferred stock at a $25 par value and 6,750,000 shares of preferred stock without par value. LG&E had no preferred stock issued or outstanding in 2012, 2011 or 2010.

(KU)

KU is authorized to issue up to 5,300,000 shares of preferred stock without par value. KU had no preferred stock issued or outstanding in 2012, 2011 or 2010.

Preference Stock

(PPL Electric)

PPL Electric is authorized to issue up to 10 million shares of Preference Stock and had 2.5 million shares of 6.25% Series Preference Stock (Preference Shares) issued and outstanding at December 31, 2011 and 2010. In June 2012, PPL Electric redeemed all 2.5 million shares of its outstanding Preference Shares, par value of $100 per share. The price paid for the redemption was the par value, without premium ($250 million in the aggregate).

The Preference Shares were held by a bank that acted as depositary for 10 million depositary shares, each of which represented a one-quarter interest in a Preference Share. Holders of the depositary shares were entitled to all proportional rights and preferences of the Preference Shares, including dividend, voting, redemption and liquidation rights, exercised through the bank acting as a depositary. The Preference Shares ranked senior to PPL Electric's common stock but had no voting rights, except as provided by law, and they had a liquidation preference of $100 per share (equivalent to $25 per depositary share).

(KU)

KU is authorized to issue up to 2,000,000 shares of preference stock without par value. KU had no preference stock issued or outstanding in 2012, 2011 or 2010.

Preferred Securities [Line Items]