The capacity of the company's baseload generation fleet.

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The amount of cash collateral posted under master netting arrangements.

+ References

No definition available.

+ Details

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Namespace Prefix:	ppl_
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- Details

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- Details

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- Definition

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

+ References

No definition available.

+ Details

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Data Type:	num:powerItemType
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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

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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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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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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- Definition

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

+ 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.

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- 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 Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994

Reference 2: 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.

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Derivative Instruments and Hedging Activities (Intro) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 MW	Mar. 31, 2012	Dec. 31, 2012
Master Netting Arrangements (Numeric) [Line Items]
Obligation to return cash collateral obligation under master netting arrangement	$ 49		$ 112
Cash collateral posted under master netting arrangements	27		32
Commodity Price Risk (Non-trading) [Line Items]
Baseload generation fleet capacity (in MW)	7,298
Intermediate and peaking generation fleet capacity (in MW)	3,316
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	99
No or insignificant amounts previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts	insignificant	insignificant
No or immaterial hedge ineffectiveness related to commodity price risk cash flow hedge contracts		insignificant
Commodity Price Risk (Non-trading) - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of economic activity derivative contracts	2019
Unregulated Retail Electric And Gas [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(8)	10
Wholesale Energy Marketing [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(822)	852
Fuel [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(1)	2
Energy Purchases [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	634	(591)
PPL Energy Supply LLC [Member]
Master Netting Arrangements (Numeric) [Line Items]
Obligation to return cash collateral obligation under master netting arrangement	49		112
Commodity Price Risk (Non-trading) [Line Items]
Baseload generation fleet capacity (in MW)	7,298
Intermediate and peaking generation fleet capacity (in MW)	3,316
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	99
No or insignificant amounts previously recorded in AOCI reclassified to earnings related to commodity price risk cash flow hedge contracts	insignificant	insignificant
No or immaterial hedge ineffectiveness related to commodity price risk cash flow hedge contracts		insignificant
Commodity Price Risk (Non-trading) - Economic Activity (Numeric) [Abstract]
Year of expiration of the maximum maturity date of economic activity derivative contracts	2019
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)	(8)	10
PPL Energy Supply LLC [Member] \| Wholesale Energy Marketing [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(822)	852
PPL Energy Supply LLC [Member] \| Fuel [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	(1)	2
PPL Energy Supply LLC [Member] \| Energy Purchases [Member]
Pre-tax Gains (Losses) of Economic Activity - Unregulated Business (Details) [Abstract]
Pre-tax gain (loss)	634	(591)
LG And E And KU Energy LLC [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	27		32
Louisville Gas And Electric Co [Member]
Master Netting Arrangements (Numeric) [Line Items]
Cash collateral posted under master netting arrangements	$ 27		$ 32