Fair Value Measurements and Credit Concentration (Nonrecurring Fair Value Measurements and Credit Concentration) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Credit Concentration Associated with Financial Instruments (Numeric) [Abstract]
Gross credit exposure from energy trading partners	$ 1,000,000,000
Net credit exposure to energy trading partners	539,000,000
Dollar exposure to top ten energy trading counterparties	281,000,000
Percentage exposure to top ten energy trading counterparties	52.00%
Number of counterparties in top ten that have investment grade credit rating	9
Percentage of top ten's exposure that consists of counterparties with investment grade credit rating (in hundreths)	95.00%
Carrying Amount [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Contract adjustment payments	21,000,000	[1]	105,000,000	[1]
Long-term debt	20,907,000,000		19,476,000,000
Fair Value [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Contract adjustment payments	22,000,000		106,000,000
Long-term debt	22,177,000,000		21,671,000,000
Nonrecurring [Member] | Carrying Amount [Member]
Nonrecurring Fair Value Measurements [Abstract]
Corette plant and emission allowances	65,000,000	[2]
Equity investment in EEI			25,000,000	[2]
RECs					6,000,000	[2],[3]
Nonrecurring [Member] | Level 2 [Member]
Nonrecurring Fair Value Measurements [Abstract]
Corette plant and emission allowances
Equity investment in EEI
RECs					1,000,000	[3]
Nonrecurring [Member] | Level 3 [Member]
Nonrecurring Fair Value Measurements [Abstract]
Corette plant and emission allowances
Equity investment in EEI
RECs
Nonrecurring [Member] | Loss [Member]
Nonrecurring Fair Value Measurements [Abstract]
Corette plant and emission allowances	65,000,000	[4]
Equity investment in EEI			25,000,000	[4]
RECs					5,000,000	[3],[4]
PPL Energy Supply LLC [Member]
Credit Concentration Associated with Financial Instruments (Numeric) [Abstract]
Gross credit exposure from energy trading partners	1,000,000,000
Net credit exposure to energy trading partners	536,000,000
Dollar exposure to top ten energy trading counterparties	281,000,000
Percentage exposure to top ten energy trading counterparties	52.00%
Number of counterparties in top ten that have investment grade credit rating	9
Percentage of top ten's exposure that consists of counterparties with investment grade credit rating (in hundreths)	95.00%
PPL Energy Supply LLC [Member] | Carrying Amount [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	2,525,000,000		3,272,000,000
PPL Energy Supply LLC [Member] | Fair Value [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	2,658,000,000		3,556,000,000
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Carrying Amount [Member]
Nonrecurring Fair Value Measurements [Abstract]
Corette plant and emission allowances	65,000,000	[2]
RECs					6,000,000	[2],[3]
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Level 2 [Member]
Nonrecurring Fair Value Measurements [Abstract]
Corette plant and emission allowances
RECs					1,000,000	[3]
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Level 3 [Member]
Nonrecurring Fair Value Measurements [Abstract]
Corette plant and emission allowances
RECs
PPL Energy Supply LLC [Member] | Nonrecurring [Member] | Loss [Member]
Nonrecurring Fair Value Measurements [Abstract]
Corette plant and emission allowances	65,000,000	[4]
RECs					5,000,000	[3],[4]
PPL Electric Utilities Corp [Member] | Carrying Amount [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	2,315,000,000		1,967,000,000
PPL Electric Utilities Corp [Member] | Fair Value [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	2,483,000,000		2,333,000,000
LG And E And KU Energy LLC [Member] | Carrying Amount [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	4,565,000,000		4,075,000,000
LG And E And KU Energy LLC [Member] | Fair Value [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	4,672,000,000		4,423,000,000
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Carrying Amount [Member]
Nonrecurring Fair Value Measurements [Abstract]
Equity investment in EEI			25,000,000	[2]
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Level 2 [Member]
Nonrecurring Fair Value Measurements [Abstract]
Equity investment in EEI
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Level 3 [Member]
Nonrecurring Fair Value Measurements [Abstract]
Equity investment in EEI
LG And E And KU Energy LLC [Member] | Nonrecurring [Member] | Loss [Member]
Nonrecurring Fair Value Measurements [Abstract]
Equity investment in EEI			25,000,000	[4]
Louisville Gas And Electric Co [Member] | Carrying Amount [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	1,353,000,000		1,112,000,000
Louisville Gas And Electric Co [Member] | Fair Value [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	1,372,000,000		1,178,000,000
Kentucky Utilities Co [Member] | Carrying Amount [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	2,091,000,000		1,842,000,000
Kentucky Utilities Co [Member] | Fair Value [Member]
Fair value of Financial Instruments Not Recorded at Fair Value - Other
Long-term debt	2,155,000,000		2,056,000,000
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Carrying Amount [Member]
Nonrecurring Fair Value Measurements [Abstract]
Equity investment in EEI			25,000,000	[2]
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Level 2 [Member]
Nonrecurring Fair Value Measurements [Abstract]
Equity investment in EEI
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Level 3 [Member]
Nonrecurring Fair Value Measurements [Abstract]
Equity investment in EEI
Kentucky Utilities Co [Member] | Nonrecurring [Member] | Loss [Member]
Nonrecurring Fair Value Measurements [Abstract]
Equity investment in EEI			$ 25,000,000	[4]

[1] Included in "Other current liabilities" and "Other deferred credits and noncurrent liabilities" on the Balance Sheets.

[2] Represents carrying value before fair value measurement.

[3] Current and long-term RECs are included in "Other current assets" and "Other intangibles" in their respective areas on the Balance Sheets.

[4] The loss on the Corette plant and emission allowances was recorded in the Supply segment and included in "Other operation and maintenance" on the Statement of Income. The loss on the EEI investment was recorded in the Kentucky Regulated segment and included in "Other-Than-Temporary Impairments" on the Statement of Income. Losses on RECs were recorded in the Supply segment and included in "Other operation and maintenance" on the Statements of Income.