Financing Activities (Short-term Debt) (Details) (Commercial Paper [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Capacity	$ 1,000
Commercial paper issuances	494us-gaap_CommercialPaper	500us-gaap_CommercialPaper
Unused capacity	506
PPL Electric [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.57%
Capacity	300
Commercial paper issuances	85
Unused capacity	215
LGE [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.63%	0.42%
Capacity	350
Commercial paper issuances	216	264
Unused capacity	134
KU [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.62%	0.49%
Capacity	350
Commercial paper issuances	193	236
Unused capacity	157
PPL Electric Utilities Corp [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.57%
Capacity	300
Commercial paper issuances	85
Unused capacity	215
LG And E And KU Energy LLC [Member] \| LGE [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.63%	0.42%
Capacity	350
Commercial paper issuances	216	264
Unused capacity	134
LG And E And KU Energy LLC [Member] \| KU [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.62%	0.49%
Capacity	350
Commercial paper issuances	193	236
Unused capacity	157
Louisville Gas And Electric Co [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.63%	0.42%
Capacity	350
Commercial paper issuances	216	264
Unused capacity	134
Kentucky Utilities Co [Member]
Short-term Debt [Line Items]
Weighted-average interest rate	0.62%	0.49%
Capacity	350
Commercial paper issuances	193	236
Unused capacity	$ 157

Amount of unused borrowing capacity under the commercial paper financing arrangement that is available to the entity as of the balance sheet date.

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the short-term credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

No definition available.

+ Details

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- Definition

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(a)(3))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.13(2))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph a(3)

-Article 5

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 13

-Subparagraph 2

-Article 9

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- Details

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- Definition

Weighted average interest rate of short-term debt outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19

-Subparagraph b

-Article 5

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