Financing Activities (Short-term Debt) (Details)	12 Months Ended									12 Months Ended		1 Months Ended		12 Months Ended
	Dec. 31, 2011 Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] USD ($)	Mar. 31, 2011 Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] GBP (£)	Dec. 31, 2012 PPL Energy Supply [Member] Commercial Paper [Member] USD ($)	Mar. 31, 2012 PPL Energy Supply [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2011 PPL Energy Supply [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2012 PPL Electric [Member] Commercial Paper [Member] USD ($)	Apr. 30, 2012 PPL Electric [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2012 LGE [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2012 KU [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2011 PPL Capital Funding [Member] Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] USD ($)	Dec. 31, 2011 PPL Capital Funding [Member] Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] GBP (£)	May 31, 2011 PPL WEM [Member] Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] GBP (£)	Apr. 30, 2011 PPL WEM [Member] Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] GBP (£)	Dec. 31, 2011 PPL WEM [Member] Bridge Loan 2011 [Member] Expired Short Term Debt Facility [Member] GBP (£)	Dec. 31, 2012 PPL Energy Supply LLC [Member] Commercial Paper [Member] USD ($)	Mar. 31, 2012 PPL Energy Supply LLC [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2011 PPL Energy Supply LLC [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2012 PPL Electric Utilities Corp [Member] Commercial Paper [Member] USD ($)	Apr. 30, 2012 PPL Electric Utilities Corp [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2012 LG And E And KU Energy LLC [Member] LGE [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2012 LG And E And KU Energy LLC [Member] KU [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2012 Louisville Gas And Electric Co [Member] Commercial Paper [Member] USD ($)	Dec. 31, 2012 Kentucky Utilities Co [Member] Commercial Paper [Member] USD ($)
Short-term Debt [Line Items]
Capacity			$ 750,000,000	$ 500,000,000		$ 300,000,000	$ 200,000,000	$ 250,000,000	$ 250,000,000						$ 750,000,000	$ 500,000,000		$ 300,000,000	$ 200,000,000	$ 250,000,000	$ 250,000,000	$ 250,000,000	$ 250,000,000
Commercial paper outstanding			356,000,000		400,000,000			55,000,000	70,000,000						356,000,000		400,000,000			55,000,000	70,000,000	55,000,000	70,000,000
Weighted-average interest rate on outstanding borrowings			0.50%		0.53%			0.42%	0.42%						0.50%		0.53%			0.42%	0.42%	0.42%	0.42%
Original committed capacity of Bridge Facility		3,600,000,000
Fees incurrred in connection with Bridge Facility	44,000,000
Borrowings during period on short-term facility											1,750,000,000			1,850,000,000
Interest rate on facility										2.62%	2.62%			2.62%
Libor rates for borrowings	one-month LIBOR plus a spread
Repayments during period on short-term facility										$ 2,800,000,000		£ 1,200,000,000	£ 650,000,000