Obligation to return cash collateral received from counterparties under terms of a master netting arrangement.

No definition available.

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Namespace Prefix:	ppl_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

The amount of cash collateral posted under master netting arrangements.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

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- Definition

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

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

The amount of gain (loss) recorded into earnings when price risk cash flow hedge has been dedesignated. When this occurs, the effective portion of the hedge is locked in accumulated other comprehensive income (loss). Future changes in mark-to-market value are recorded in earnings. The underlying delivery of the related product is expected to continue.

+ References

No definition available.

+ Details

Name:	ppl_GainLossOnDedesignatedPriceRiskCashFlowHedge
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Data Type:	xbrli:monetaryItemType
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- Details

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- Definition

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

+ References

No definition available.

+ Details

Name:	ppl_MaximumMaturityDateOfEconomicActivityInstruments
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- Definition

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.

+ Details

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- Details

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- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

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

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624171-113959

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum length of time over which the entity is hedging its exposure to the variability in future cash flows for forecasted transactions, excluding those forecasted transactions related to the payment of variable interest on existing financial instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_PriceRiskCashFlowHedgeIneffectivenessIsImmaterial
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

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Derivative Instruments and Hedging Activities (Intro) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Master Netting Arrangements (Numeric) [Line Items]
Obligation to return cash collateral obligation under master netting arrangement	$ 205		$ 205		$ 147
Cash collateral posted under master netting arrangements	31		31		29
Commodity Price Risk (Non-trading) - Cash Flow Hedges (Numeric) [Abstract]
Year of expiration of the maximum maturity date of commodity price risk cash flow hedge contracts			2016
Net unrealized after-tax gains (losses) expected to be reclassified into earnings within 12 months related to commodity price risk cash flow hedge contracts	260		260
No or insignificant amounts previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts	insignificant	insignificant	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		(10)		(14)
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)	796		796		(63)
Unregulated Retail Electric And Gas [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(12)	1	(2)	5
Wholesale Energy Marketing [Member]
Commodity Price Risk (Non-trading) - Cash Flow Hedges (Numeric) [Abstract]
Pre-tax gain (loss) resulting from dedesignation of cash flow hedges			123
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(458)	(44)	394	13
Fuel [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(16)	(11)	(14)	12
Energy Purchases [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	442	109	(149)	127
PPL Energy Supply LLC [Member]
Master Netting Arrangements (Numeric) [Line Items]
Obligation to return cash collateral obligation under master netting arrangement	205		205		147
Commodity Price Risk (Non-trading) - Cash Flow Hedges (Numeric) [Abstract]
Year of expiration of the maximum maturity date of commodity price risk cash flow hedge contracts			2016
Net unrealized after-tax gains (losses) expected to be reclassified into earnings within 12 months related to commodity price risk cash flow hedge contracts	260		260
No or insignificant amounts previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts	insignificant	insignificant	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		(10)		(14)
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)	796		796		(63)
PPL Energy Supply LLC [Member] \| Unregulated Retail Electric And Gas [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(12)	1	(2)	5
PPL Energy Supply LLC [Member] \| Wholesale Energy Marketing [Member]
Commodity Price Risk (Non-trading) - Cash Flow Hedges (Numeric) [Abstract]
Pre-tax gain (loss) resulting from dedesignation of cash flow hedges			123
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(458)	(44)	394	13
PPL Energy Supply LLC [Member] \| Fuel [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(16)	(11)	(14)	12
PPL Energy Supply LLC [Member] \| Energy Purchases [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	442	109	(149)	127
LG And E And KU Energy LLC [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	31		31		29
Louisville Gas And Electric Co [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	$ 31		$ 31		$ 29