Financing Activities (Short-term Debt) (Details) (Commercial Paper [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Capacity	$ 1,000
Commercial paper issuances	273	190
Unused capacity	727
PPL Electric [Member]
Short-term Debt [Line Items]
Weighted-average interest rate		0.23%
Capacity	300
Commercial paper issuances		20
Unused capacity	300
LGE [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.29%
Capacity	350
Commercial paper issuances	143	20
Unused capacity	207
KU [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.32%
Capacity	350
Commercial paper issuances	130	150
Unused capacity	220
PPL Electric Utilities Corp [Member]
Short-term Debt [Line Items]
Weighted-average interest rate		0.23%
Capacity	300
Commercial paper issuances		20
Unused capacity	300
LG And E And KU Energy LLC [Member] | LGE [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.29%
Capacity	350
Commercial paper issuances	143	20
Unused capacity	207
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	130	150
Unused capacity	220
Louisville Gas And Electric Co [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.29%
Capacity	350
Commercial paper issuances	143	20
Unused capacity	207
Kentucky Utilities Co [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.32%
Capacity	350
Commercial paper issuances	130	150
Unused capacity	$ 220