Derivative Instruments and Hedging Activities (Intro) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013 MW	Dec. 31, 2012	Dec. 31, 2011
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	$ 22	$ 32
Commodity Price Risk (Non-trading) [Line Items]
Baseload generation fleet capacity (in MW)	7,369
Intermediate and peaking generation fleet capacity (in MW)	3,309
Commodity Price Risk (Non-trading) - Cash Flow Hedges (Numeric) [Abstract]
Net unrealized after-tax gains (losses) expected to be reclassified into earnings within 12 months related to commodity price risk cash flow hedge contracts	25
No or insignificant amounts previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts	no reclassifications	insignificant	insignificant
No or immaterial hedge ineffectiveness related to commodity price risk cash flow hedge contracts	insignificant	insignificant
Hedge ineffectiveness after-tax gains (losses) related to commodity price risk cash flow hedge contracts			(22)
Commodity Price Risk (Non-trading) - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of economic activity derivative contracts	2019
Fair value of commodity contracts classified as economic activity, net asset (liability)	107	346
Unregulated Retail Energy [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	12	(17)	31
Unregulated Wholesale Energy [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(721)	(311)	1,407
Fuel [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(4)	(14)	6
Energy Purchases [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	586	442	(1,123)
PPL Energy Supply LLC [Member]
Master Netting Arrangements (Numeric) [Line Items]
Obligation to return cash collateral obligation under master netting arrangement	9	112
Commodity Price Risk (Non-trading) [Line Items]
Baseload generation fleet capacity (in MW)	7,369
Intermediate and peaking generation fleet capacity (in MW)	3,309
Commodity Price Risk (Non-trading) - Cash Flow Hedges (Numeric) [Abstract]
Net unrealized after-tax gains (losses) expected to be reclassified into earnings within 12 months related to commodity price risk cash flow hedge contracts	25
No or insignificant amounts previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts	no reclassifications	insignificant	insignificant
No or immaterial hedge ineffectiveness related to commodity price risk cash flow hedge contracts	insignificant	insignificant
Hedge ineffectiveness after-tax gains (losses) related to commodity price risk cash flow hedge contracts			(22)
Commodity Price Risk (Non-trading) - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of economic activity derivative contracts	2019
Fair value of commodity contracts classified as economic activity, net asset (liability)	107	346
PPL Energy Supply LLC [Member] \| Unregulated Retail Energy [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	12	(17)	31
PPL Energy Supply LLC [Member] \| Unregulated Wholesale Energy [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(721)	(311)	1,407
PPL Energy Supply LLC [Member] \| Fuel [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(4)	(14)	6
PPL Energy Supply LLC [Member] \| Energy Purchases [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	586	442	(1,123)
LG And E And KU Energy LLC [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	22	32
Louisville Gas And Electric Co [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	$ 22	$ 32

The capacity of the company's baseload generation fleet.

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The amount of cash collateral posted under master netting arrangements.

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The period end fair value of commodity contracts classified as economic activity. The fair value results in a net (asset) or liability position.

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No definition available.

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The capacity of the company's intermediate and peaking generation fleet.

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Maximum length of time over which the entity is economically hedging its exposure to the variability in future cash flows for forecasted transactions.

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Amount of pre-tax gains (losses) from economic activity related to price and volume risk derivative instruments not designated as hedging instruments, the ineffective portion of qualifying cash flow hedges, and the entire change in fair value of certain cash flow hedges that fail retrospective effectiveness testing.

+ References

No definition available.

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A disclosure of an assertion that the amount of net gains (losses) reclassified into earnings when price risk cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period is insignificant or zero.

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Amount of obligation to return cash collateral under master netting arrangements that have not been offset against derivative assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 13

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-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 8

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The net gain (loss) recognized in earnings during the period due to ineffectiveness in price risk cash flow hedges.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

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-Paragraph 4C

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Assertion that the amount of price risk cash flow hedge ineffectiveness is immaterial.

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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

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