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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2010 USD ($)	Sep. 30, 2011 GBP (£)	Dec. 31, 2010 USD ($)
Interest Rate Risk - Cash Flow Hedges (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate cash flow hedge contracts				2022
Notional value of interest rate cash flow hedge contracts (excludes cross-currency contracts)	$ 550			$ 550
Insignificant or no hedge ineffectiveness associated with interest rate cash flow hedges	insignificant		insignificant		insignificant
Hedge ineffectiveness associated with interest rate cash flow hedges		(5)		(13)
Net notional value of PPL WEM's cross-currency cash flow hedge contracts	960			960
Net notional value of PPL WW cross-currency cash flow hedge contracts	302			302
Latest maturity date of PPL WW cross-currency cash flow hedge contracts	December 2028			December 2028
Latest maturity date of PPL WEM cross-currency cash flow hedge contracts	2021			2021
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts	no such reclassifications			no such reclassifications
Pre-tax gains (losses) reclassified to earnings related to interest rate cash flow hedge contracts due to discontinuance of forecasted transaction			(29)		(29)
After-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts			(19)		(19)
Net unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months	(11)			(11)
Interest Rate Risk - Fair Value Hedges (Numeric) [Abstract]
Year of expiration of the maximum maturity date of interest rate fair value hedge contracts				2047
Notional value of interest rate fair value hedges	99			99
No or insignificant hedge ineffectiveness associated with interest rate fair value hedges	did not recognize		did not recognize	did not recognize	did not recognize
No or insignificant gains (losses) associated with interest rate fair value hedges being excluded from the assessment of hedge effectiveness	did not recognize		did not recognize	did not recognize	did not recognize
Gain (loss) resulting from firm commitments that no longer qualified as interest rate fair value hedges	14			14
No or insignificant gain (loss) resulting from firm commitments that no longer qualified as interest rate fair value hedges			no such gains or losses		no such gains or losses
Principal amount of debt related to discontinuance of fair value hedge				400
Interest rate on debt related to discontinuance of fair value hedge (in hundredths)				7.125%
Gain (loss) resulting from firm commitments no longer qualifying as interest rate fair value hedges, pre-tax	22			22
Interest Rate Risk - Economic Activity (Numeric) [Abstract]
Notional amount of interest rate swaps classified as economic activity	179			179
Year of expiration of the maximum maturity date of interest rate economic activity contracts				2033
The fair value, net (asset) or liability, of interest rate swap contracts classified as economic activity	57			57			34
Amounts reclassified to regulatory assets from AOCI	22			23
Foreign Currency Risk - Cash Flow Hedges (Numeric) [Abstract]
No or insignificant after-tax gains (losses) previously recorded in AOCI reclassified to earnings related to foreign currency cash flow hedge contracts	no cash flow hedges were discontinued		no cash flow hedges were discontinued	no cash flow hedges were discontinued	no cash flow hedges were discontinued
No or insignificant unrealized after-tax gains (losses) on foreign currency cash flow hedge contracts expected to be reclassified into earnings during next 12 months	Insignificant			Insignificant
Foreign Currency Risk - Fair Value Hedges (Numeric) [Abstract]
No or insignificant hedge ineffectiveness associated with foreign currency fair value hedges	no gains or losses		no gains or losses	no gains or losses	no gains or losses
No or insignificant gains (losses) associated with foreign currency fair value hedges being excluded from the assessment of hedge effectiveness	no gains or losses		no gains or losses	no gains or losses	no gains or losses
No or insignificant gain (loss) resulting from firm commitments that no longer qualified as foreign currency fair value hedges	no gains or losses		no gains or losses	no gains or losses	no gains or losses
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]
Notional amount of net investment hedge contracts	106			106		65
Earliest settlement date of net investment hedge contracts				January 2012
Latest settlement date of net investment hedge contracts				June 2012
Fair value of net asset position of net investment hedge contracts	5			5
Net after tax gains (losses) on net investment hedges included in the foreign currency translation adjustment component of AOCI	18			18			15
Insignificant or no net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of OCI	insignificant amount		insignificant amount	insignificant amount	insignificant amount
Foreign Currency Risk - Economic Activity (Numeric) [Abstract]
Gains (losses) on foreign currency contracts related to debt or commitments hedged with foreign currency contracts classified as economic activity				55
Total exposure hedged related to foreign currency contracts for anticipated earnings hedges classified as economic activity						393
Fair value of net asset position of foreign currency contracts for anticipated earnings hedges classified as economic activity	16			16
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity				October 2011
Latest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity				November 2012
Gains (losses) on foreign currency contracts for anticipated earnings hedges classified as economic activity	$ 11			$ 11
Insignificant or no gains (losses) on foreign currency contracts for anticipated earnings hedges classified as economic activity			insignificant		insignificant
Insignificant or no gains (losses) on foreign currency contracts related to debt or commitments hedged with foreign currency contracts classified as economic activity	insignficant