Amount of sales to California ISO markets from October 2000 to June 2001 that have not been paid for at date of balance sheet.

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Amount of sales to California ISO markets from October 2000 to June 2001 that is recoverable if approved by the FERC.

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Amount of compensation awarded in 2008 by the Montana District Court regarding the company's use of navigable riverbeds for 2007.

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The longest term, in years, of purchases for electricy supply for customers under obligation as provider of last resort under current solicitation plan.

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The shortest term, in months, of purchases for electricy supply for customers under obligation as provider of last resort under current solicitation plan.

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Pre-tax charge for litigation regarding the company's use of navigable riverbeds in Montana related to compensation for the period between 2000 and the first quarter of 2010.

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Period of years from December 1998 that the company was required to respond to the FERC with market analysis information after implementing market-based rates.

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The amount of interest to be received as a result of a settlement related to previous sales made to the California ISO during the period October 2000 through June 2001.

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The company's end of period loss accrual related to litigation for the company's use of navigable riverbeds in Montana.

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The amount of compensation damages requested by MISO from PJM in filings with FERC for alleged modeling errors, excluding interest.

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The amount of recovery sought by PJM from MISO for alleged mark-to-market power flow calculation violations.

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The annual interest rate applied to the amounts being accrued.

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Per share (basic and diluted) impact of the after-tax charge for litigation regarding the company's use of navigable riverbeds in Montana related to compensation for the period between 2000 and the first quarter of 2010.

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After-tax charge for litigation regarding the company's use of navigable riverbeds in Montana related to compensation for the period between 2000 and the first quarter of 2010.

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Portion of pre-tax charge for litigation regarding the company's use of navigable riverbeds in Montana reflected in "Interest Expense" related to compensation for the period between 2000 and the first quarter of 2010.

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Portion of pre-tax charge for litigation regarding the company's use of navigable riverbeds in Montana reflected in "Other operation and maintenance" related to compensation for the period between 2000 and the first quarter of 2010.

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Portion of pre-tax charge for litigation regarding the company's use of navigable riverbeds in Montana related to compensation for the period between 2000 and 2009.

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Portion of after-tax charge for litigation regarding the company's use of navigable riverbeds in Montana related to compensation for the period between 2000 and 2009.

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- Definition

Amount of civil penalties that can be assessed by the FERC under the Federal Power Act per day, per violation, for certain violations.

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The number of complaints filed by MISO with FERC for alleged modeling errors and related matters.

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Number of competitive solicitations completed to date related to the June 2009 PUC-approved purchase plan for PLR supply after 2010.

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- Definition

Entity's contingent potential proportionate share of OVEC's outstanding debt.

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Represents the company's share of the settlement for litigation related to the U.S. government's responsibility to provide for the permanent disposal of commercial spent nuclear fuel. The settlement is in lieu of the government providing a repository site for reimbursment to a company's subsidiary costs incurred to store spent nuclear fuel through September 30, 2009. In addition, the agreement provides the ability to receive payment of annual claims for allowed costs, as set forth in the settlement agreement, that are incurred thereafter through the December 31, 2013 termination date of the settlement agreement.

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Frequency (in years), after initial filing, that the company is required to respond to the FERC with market analysis information after implementing market-based rates.

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Amount of compensation awarded in 2008 by the Montana District Court regarding the company's use of navigable riverbeds for periods 2000 to 2006.

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Total number of competitive solicitations to be conducted under the June 2009 PUC-approved purchase plan for PLR supply after 2010.

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- Definition

Revenue derived from energy-related services such supplying various forms of energy (such as steam, electricity and chilled water from the operation of on-site facilities or cogeneration plants), procurement services provided to energy purchasers, and the marketing and trading of energy commodities and derivatives.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 1

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

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-Name Accounting Standards Codification

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-Section S99

-Paragraph 2

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The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than four and within five years from the balance sheet date.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 7

-Subparagraph b

-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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-SubTopic 10

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The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid within one year of the balance sheet date.

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The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than three and within four years from the balance sheet date.

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The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than one and within two years from the balance sheet date.

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The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid in more than two and within three years from the balance sheet date.

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The amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation as of the balance sheet date.

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The remaining amount of the fixed and determinable portion of an unrecorded unconditional purchase obligation to be paid after five years from the balance sheet date.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The amount purchased during the period under an unrecorded unconditional purchase obligation (for example, under the take-or-pay or throughput contract).

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 47

-Paragraph 7

-Subparagraph d

-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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-Topic 440

-SubTopic 10

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Commitments and Contingencies (Energy Purchases, Energy Sales, Other Commitments and Legal Matters) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended
	Oct. 31, 2011	Mar. 31, 2010	Sep. 30, 2011	Sep. 30, 2011 Power Purchase [Member]	Sep. 30, 2011 Power Purchase [Member]
Energy Purchase Commitments (Numeric) [Abstract]
Contingent potential proportionate share of OVEC's outstanding debt			$ 113
Number of competitive solicitations conducted to date under the June 2009 PUC-approved purchase plan for PLR supply after 2010	9
Total number of competitive solicitations to be conducted under June 2009 PUC-approved purchase plan for PLR supply requirements after 2010	14
Shortest term, in months, of PPL Electric PLR solicitations			5
Longest term, in years, of PPL Electric PLR solicitations			10
Unrecorded Unconditional Purchase Obligation [Line Items]
2012				28	28
2013				29	29
2014				29	29
2015				30	30
2016				30	30
Thereafter				907	907
Total future obligation				1,053	1,053
Purchases				9	26
Legal Matters - Spent Nuclear Fuel Litigation (Numeric) [Abstract]
PPL's share of settlement for spent nuclear fuel litigation			50
Legal Matters - Montana Hydroelectric Litigation (Numeric) [Abstract]
Amount of compensation awarded in 2008 by the Montana District Court regarding PPL Montana's use of navigable riverbeds for periods 2000 to 2006			35
Amount of compensation awarded in 2008 by the Montana District Court regarding PPL Montana's use of navigable riverbeds for 2007			6
Pre-tax charge for the Montana Hydroelectric Litigation related to compensation for the periods between 2000 and the first quarter of 2010		56
After-tax charge for the Montana Hydroelectric Litigation related to compensation for the periods between 2000 and the first quarter of 2010		34
Per share (basic and diluted) impact of the after-tax charge for the Montana Hydroelectric Litigation related to compensation for the periods between 2000 and the first quarter of 2010		$ 0.08
Portion of pre-tax charge for the Montana Hydroelectric Litigation related to compensation for the periods between 2000 and 2009		54
Portion of after-tax charge for the Montana Hydroelectric Litigation related to compensation for the periods between 2000 and 2009		32
Portion of pre-tax charge for the Montana Hydroelectric Litigation related to compensation for the period between 2000 and the first quarter of 2010 that is reflected in Other operation and maintenance		49
Portion of pre-tax charge for the Montana Hydroelectric Litigation related to compensation for the period between 2000 and the first quarter of 2010 that is reflected in Interest Expense		7
End of period loss accrual for the Montana Hydroelectric Litigation			84
Interest rate per year (in hundredths)			10.00%
Legal Matters - PJM/MISO Billing Dispute (Numeric) [Abstract]
Number of complaints filed with the FERC regarding the modeling error and related matters in the PJM/MISO billing dispute			2
Amount of recovery sought by MISO from PJM for alleged modeling error, excluding interest			130
Amount of recovery sought by PJM from MISO for alleged violations regarding mark-to-market power flow calculations			25
Regulatory Issues - California ISO and Western U.S. Markets (Numeric) [Abstract]
Amount of sales to the California ISO from October 2000 through June 2001			18
Amount of receivable from California ISO related to sales from October 2000 through June 2001			17
Portion of sales recoverable from California ISO			1
Amount of interest to be received related to CAL ISO			1
Regulatory Issues - FERC Market-Based Rate Authority (Numeric) [Abstract]
Time from December 1998 that a subsidiary was required to respond to the FERC market analysis information request (in years)			3
Frequency, after initial filing, that a subsidiary is required to respond to the FERC market analysis information request (in years)			3
Regulatory Issues - Energy Policy Act of 2005 - Reliability Standards (Numeric) [Abstract]
Maximum per day penalties for reliability violations			$ 1