Financing Activities (Short-term Debt) (Details) (Commercial Paper [Member], USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Capacity	$ 1,750
Commercial paper issuances	394	190
Unused capacity	1,356
PPL Energy Supply [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.75%
Capacity	750
Commercial paper issuances	149
Unused capacity	601
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	70	20
Unused capacity	280
KU [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.32%
Capacity	350
Commercial paper issuances	175	150
Unused capacity	175
PPL Energy Supply LLC [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.75%
Capacity	750
Commercial paper issuances	149
Unused capacity	601
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	70	20
Unused capacity	280
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	175	150
Unused capacity	175
Louisville Gas And Electric Co [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.29%
Capacity	350
Commercial paper issuances	70	20
Unused capacity	280
Kentucky Utilities Co [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.29%	0.32%
Capacity	350
Commercial paper issuances	175	150
Unused capacity	$ 175