Income and Other Taxes (Unrecognized to End) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Integer		Dec. 31, 2012	Dec. 31, 2011
Unrecognized Tax Benefits (Details) [Roll Forward]
Beginning of period	$ 92		$ 145
Additions based on tax positions of prior years	3		15
Reductions based on tax positions of prior years	(32)		(61)
Additions based on tax positions related to the current year			7
Reductions based on tax positions related to the current year			(3)
Settlements	(30)		(2)
Lapse of applicable statute of limitation	(11)		(9)
End of period	22		92	145
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	22
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate	21		38
Open Tax Positions - Accrued Interest (Numeric) [Abstract]
Accrued interest receivable (payable) related to tax positions	15		(16)
Open Tax Positions - Interest and Penalties (Numeric) [Abstract]
Interest expense (benefit) related to tax positions	(30)		(4)	27
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed	5
US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	1997 and prior
Pennsylvania - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2009 and prior
Kentucky - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2008 and prior
Montana - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2009 and prior
United Kingdom - Foreign [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2011 and prior
PPL Energy Supply LLC [Member]
Unrecognized Tax Benefits (Details) [Roll Forward]
Beginning of period	30		28
Additions based on tax positions of prior years			4
Reductions based on tax positions of prior years	(15)		(2)
End of period	15		30	28
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
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate	14		13
Open Tax Positions - Accrued Interest (Numeric) [Abstract]
Accrued interest receivable (payable) related to tax positions	15		17
Open Tax Positions - Interest and Penalties (Numeric) [Abstract]
Interest expense (benefit) related to tax positions	5		(4)	6
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed	3
PPL Energy Supply LLC [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	1997 and prior
PPL Energy Supply LLC [Member] | Pennsylvania - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2009 and prior
PPL Energy Supply LLC [Member] | Montana - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2009 and prior
PPL Electric Utilities Corp [Member]
Unrecognized Tax Benefits (Details) [Roll Forward]
Beginning of period	26		73
Reductions based on tax positions of prior years	(17)		(43)
Additions based on tax positions related to the current year			5
Lapse of applicable statute of limitation	(9)		(9)
End of period			26	73
Unrecognized Tax Benefits - Probable Increase (Decrease) Next 12 Months (Details) [Abstract]
Total unrecognized tax benefits and related effects that, if recognized, would decrease the effective tax rate			3
Open Tax Positions - Accrued Interest (Numeric) [Abstract]
Accrued interest receivable (payable) related to tax positions	3		1
Open Tax Positions - Interest and Penalties (Numeric) [Abstract]
Interest expense (benefit) related to tax positions	$ (7)		$ (4)	$ (5)
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed	2
PPL Electric Utilities Corp [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	1997 and prior
PPL Electric Utilities Corp [Member] | Pennsylvania - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2008 and prior
LG And E And KU Energy LLC [Member]
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed	2
Years no longer subject for recently acquired subsidiary	3
LG And E And KU Energy LLC [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	10/31/2010 and prior	[1]
Years no longer subject for recently acquired subsidiary	ten month period ending October 31, 2010
LG And E And KU Energy LLC [Member] | Kentucky - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2010 and prior
Louisville Gas And Electric Co [Member]
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed	2
Years no longer subject for recently acquired subsidiary	3
Louisville Gas And Electric Co [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	10/31/2010 and prior	[1]
Years no longer subject for recently acquired subsidiary	ten month period ending October 31, 2010
Louisville Gas And Electric Co [Member] | Kentucky - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2010 and prior
Kentucky Utilities Co [Member]
Income Tax Examination (Details) [Line Items]
Number of major tax jurisdictions tax returns are filed	2
Years no longer subject for recently acquired subsidiary	3
Kentucky Utilities Co [Member] | US - Federal [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	10/31/2010 and prior	[1]
Years no longer subject for recently acquired subsidiary	ten month period ending October 31, 2010
Kentucky Utilities Co [Member] | Kentucky - State [Member]
Income Tax Examination (Details) [Line Items]
Income tax examination, year(s) no longer under examination	2010 and prior

[1]  For LKE, LG&E, and KU, the ten month period ending October 31, 2010 remains open under the standard three year statute of limitations; however, the IRS has completed its audit of these periods under the Compliance Assurance Process, effectively closing them to audit adjustments. No issues remain outstanding.