Asset Retirement Obligations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	$ 705us-gaap_AssetRetirementObligation	$ 552us-gaap_AssetRetirementObligation
Accretion	48	38
Obligations incurred	14	6
Changes in estimated cash flow or settlement date	9	123
Effect of foreign currency exchange rates	(2)	1
Obligations settled	(13)	(15)
Balance at End of Period	761us-gaap_AssetRetirementObligation	705us-gaap_AssetRetirementObligation
PPL Energy Supply LLC [Member]
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	404	375
Accretion	32	29
Obligations incurred	13	6
Changes in estimated cash flow or settlement date	(16)	1
Obligations settled	(8)	(7)
Balance at End of Period	425	404
LG And E And KU Energy LLC [Member]
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	252	131
Accretion	14	7
Obligations incurred	1	0
Changes in estimated cash flow or settlement date	23	122
Obligations settled	(5)	(8)
Balance at End of Period	285	252
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	74	62
Accretion	4	3
Changes in estimated cash flow or settlement date	1	17
Obligations settled	(5)	(8)
Balance at End of Period	74	74
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Rollforward]
Balance at Beginning of Period	178	69
Accretion	10	4
Obligations incurred	1	0
Changes in estimated cash flow or settlement date	22	105
Balance at End of Period	$ 211	$ 178

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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- Definition

Amount of the Increase or Decrease in the amount of asset retirement obligations for the period associated with foreign currency translation (to the extent that the entity accounts for the foreign currency effects as a separate component of the change in the liability).

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- Definition

Amount of asset retirement obligations incurred during the period.

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- Definition

Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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