Commitments and Contingencies (Environmental Matter and Other) (Details) $ in Millions	12 Months Ended
Dec. 31, 2015 USD ($)
PPL Electric [Member] \| PPL Electric Additional Sites [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Environmental site accrual	$ 10
Potential costs for remediation and other liabilities	30
LGE [Member] \| Mercury And Air Toxics [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	5
LGE [Member] \| LGE And KU Sites [Member] \| Coal Combustion Residuals [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	311
KU [Member] \| Mercury And Air Toxics [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	17
KU [Member] \| LGE And KU Sites [Member] \| Coal Combustion Residuals [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	661
PPL Electric Utilities Corp [Member] \| PPL Electric Additional Sites [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Environmental site accrual	10
Potential costs for remediation and other liabilities	30
LG And E And KU Energy LLC [Member] \| LGE [Member] \| Mercury And Air Toxics [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	5
LG And E And KU Energy LLC [Member] \| LGE [Member] \| LGE And KU Sites [Member] \| Coal Combustion Residuals [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	311
LG And E And KU Energy LLC [Member] \| KU [Member] \| Mercury And Air Toxics [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	17
LG And E And KU Energy LLC [Member] \| KU [Member] \| LGE And KU Sites [Member] \| Coal Combustion Residuals [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	661
Louisville Gas And Electric Co [Member] \| Mercury And Air Toxics [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	5
Louisville Gas And Electric Co [Member] \| LGE And KU Sites [Member] \| Coal Combustion Residuals [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	311
Kentucky Utilities Co [Member] \| Mercury And Air Toxics [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	17
Kentucky Utilities Co [Member] \| LGE And KU Sites [Member] \| Coal Combustion Residuals [Member]
Environmental Matters - Domestic (Numeric) [Abstract]
Potential costs for compliance	$ 661

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Total costs accrued as of the balance sheet date for environmental loss contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 25
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346

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Best estimate of the reasonably possible loss exposure in excess of the amount accrued for environmental loss contingencies at an individual site.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13237-110859

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- Definition

Best estimate of the loss exposure for reasonably possible environmental contingencies at an individual site for which no accrual has been recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 30
-Section 50
-Paragraph 10
-Subparagraph (c),(d)(2)
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