Income Taxes (Unrecognized Tax Benefits and Tax Litigation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unrecognized Tax Benefits [Abstract]
Beginning of period	$ 36	$ 113	$ 92	$ 145
Additions based on tax positions of prior years		2		6
Reductions based on tax positions of prior years			(26)	(31)
Additions based on tax positions related to the current year			4
Reductions based on tax positions related to the current year		(1)		(2)
Settlements			(30)
Lapse of applicable statutes of limitations	(5)	(2)	(9)	(6)
End of period	31	112	31	112
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Details) [Abstract]
Total amount unrecognized tax benefits may increase in next 12 months	16		16
Total amount unrecognized tax benefits may decrease in next 12 months	30		30
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate	21	34	21	34
PPL Energy Supply LLC [Member]
Unrecognized Tax Benefits [Abstract]
Beginning of period	15	31	30	28
Additions based on tax positions of prior years				4
Reductions based on tax positions of prior years			(15)	(1)
End of period	15	31	15	31
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Details) [Abstract]
Total amount unrecognized tax benefits may increase in next 12 months
Total amount unrecognized tax benefits may decrease in next 12 months	15		15
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate	14	14	14	14
PPL Electric Utilities Corp [Member]
Unrecognized Tax Benefits [Abstract]
Beginning of period	12	43	26	73
Reductions based on tax positions of prior years		(1)	(10)	(28)
Additions based on tax positions related to the current year				1
Lapse of applicable statutes of limitations	(3)	(2)	(7)	(6)
End of period	9	40	9	40
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Details) [Abstract]
Total amount unrecognized tax benefits may increase in next 12 months	16		16
Total amount unrecognized tax benefits may decrease in next 12 months	$ 8		$ 8