Financing Activities (Short-term Debt) (Details) (Commercial Paper [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Capacity	$ 1,750
Commercial paper issuances	805	190
Unused capacity	945
PPL Energy Supply [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.48%
Capacity	750
Commercial paper issuances	620
Unused capacity	130
PPL Electric [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.33%	0.23%
Capacity	300
Commercial paper issuances	60	20
Unused capacity	240
LGE [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.27%	0.29%
Capacity	350
Commercial paper issuances	15	20
Unused capacity	335
KU [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.32%
Capacity	350
Commercial paper issuances	110	150
Unused capacity	240
PPL Energy Supply LLC [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.48%
Capacity	750
Commercial paper issuances	620
Unused capacity	130
PPL Electric Utilities Corp [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.33%	0.23%
Capacity	300
Commercial paper issuances	60	20
Unused capacity	240
LG And E And KU Energy LLC [Member] | LGE [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.27%	0.29%
Capacity	350
Commercial paper issuances	15	20
Unused capacity	335
LG And E And KU Energy LLC [Member] | KU [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.32%
Capacity	350
Commercial paper issuances	110	150
Unused capacity	240
Louisville Gas And Electric Co [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.27%	0.29%
Capacity	350
Commercial paper issuances	15	20
Unused capacity	335
Kentucky Utilities Co [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.32%
Capacity	350
Commercial paper issuances	110	150
Unused capacity	$ 240