Income Taxes (Unrecognized Tax Benefits and Tax Litigation) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Unrecognized Tax Benefits [Abstract]
Beginning of period	$ 90	$ 121	$ 92	$ 145
Additions based on tax positions of prior years				4
Reductions based on tax positions of prior years	(25)	(4)	(26)	(31)
Additions based on tax positions related to the current year	3		4	1
Reductions based on tax positions related to the current year		(2)		(2)
Settlements	(30)		(30)
Lapse of applicable statutes of limitations	(2)	(2)	(4)	(4)
End of period	36	113	36	113
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	35		35
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate	23	36	23	36
PPL Energy Supply LLC [Member]
Unrecognized Tax Benefits [Abstract]
Beginning of period	30	31	30	28
Additions based on tax positions of prior years				4
Reductions based on tax positions of prior years	(15)		(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	24	46	26	73
Reductions based on tax positions of prior years	(10)	(1)	(10)	(27)
Additions based on tax positions related to the current year				1
Lapse of applicable statutes of limitations	(2)	(2)	(4)	(4)
End of period	12	43	12	43
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	11		11
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate	$ 2	$ 5	$ 2	$ 5

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The estimated lower bound of the reasonably possible change in the total amount of the unrecognized tax benefit (that will significantly increase or decrease within twelve months of the balance sheet date) for a tax position taken.

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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