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Derivative Instruments and Hedging Activities (Risk Disclosures) (Details) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Jun. 30, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 GBP (£)
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)		$ 150
Insignificant or no hedge ineffectiveness associated with interest rate cash flow hedges				insignificant
Hedge ineffectiveness associated with interest rate cash flow hedges	(4)	(9)	(9)
Net notional value of PPL WEM's cross-currency cash flow hedge contracts		960
Net notional value of PPL WW cross-currency cash flow hedge contracts		302
Latest maturity date of PPL WW cross-currency cash flow hedge contracts		2028
Latest maturity date of PPL WEM cross-currency cash flow hedge contracts		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		insignificant
After-tax gains (losses) previously recorded in AOCI reclassified to earnings related to interest rate cash flow hedge contracts			(19)
Net unrealized after-tax gains (losses) on interest rate cash flow hedge contracts expected to be reclassified into earnings during next 12 months		(12)
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
No or insignificant hedge ineffectiveness associated with interest rate fair value hedges		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
Gain (loss) resulting from firm commitments that no longer qualified as interest rate fair value hedges		14
No or insignificant gain (loss) resulting from firm commitments that no longer qualified as interest rate fair value hedges			insignificant	insignificant
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
Interest Rate Risk - Economic Activity (Numeric) [Abstract]
Notional amount of interest rate swaps classified as economic activity		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		60	34
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 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
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 or insignificant gains (losses) associated with foreign currency fair value hedges being excluded from the assessment of hedge effectiveness		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
Foreign Currency Risk - Net Investment Hedges (Numeric) [Abstract]
Notional amount of net investment hedge contracts		150			92
Earliest settlement date of net investment hedge contracts		January 2012
Latest settlement date of net investment hedge contracts		September 2012
Fair value of net asset position of net investment hedge contracts		7	7
Net after tax gains (losses) on net investment hedges included in the foreign currency translation adjustment component of AOCI		19	15
Insignificant or no net after tax gains (losses) on net investment hedges recognized in the foreign currency translation adjustment component of OCI		insignificant	insignificant	insignificant
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					288
Fair value of net asset position of foreign currency contracts for anticipated earnings hedges classified as economic activity		11
Earliest termination date of foreign currency contracts for anticipated earnings hedges classified as economic activity		January 2012
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		$ 10		$ (9)
Insignificant or no gains (losses) on foreign currency contracts for anticipated earnings hedges classified as economic activity			insignificant