Asset Retirement Obligations (Details) $ in Millions	9 Months Ended
Sep. 30, 2017 USD ($)
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	$ 488
Accretion	16
Effect of foreign exchange rates	2
Changes in estimated timing or cost	(70)
Obligations settled	(30)
Balance at End of Period	$ 406
Minimum [Member]
Asset Retirement Obligation [Roll Forward]
Regulatory Asset Amortization Period	10 years
Maximum [Member]
Asset Retirement Obligation [Roll Forward]
Regulatory Asset Amortization Period	25 years
LG And E And KU Energy LLC [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	$ 433
Accretion	15
Effect of foreign exchange rates	0
Changes in estimated timing or cost	(63)
Obligations settled	(30)
Balance at End of Period	355
Increase (Decrease) to the asset retirement obligations due to revisions in the amounts and timing of future expected costs related to the closure of CCR impoundments	$ (66)
LG And E And KU Energy LLC [Member] \| Minimum [Member]
Asset Retirement Obligation [Roll Forward]
Regulatory Asset Amortization Period	10 years
LG And E And KU Energy LLC [Member] \| Maximum [Member]
Asset Retirement Obligation [Roll Forward]
Regulatory Asset Amortization Period	25 years
Louisville Gas And Electric Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	$ 145
Accretion	5
Effect of foreign exchange rates	0
Changes in estimated timing or cost	(12)
Obligations settled	(20)
Balance at End of Period	118
Increase (Decrease) to the asset retirement obligations due to revisions in the amounts and timing of future expected costs related to the closure of CCR impoundments	$ (10)
Louisville Gas And Electric Co [Member] \| Minimum [Member]
Asset Retirement Obligation [Roll Forward]
Regulatory Asset Amortization Period	10 years
Louisville Gas And Electric Co [Member] \| Maximum [Member]
Asset Retirement Obligation [Roll Forward]
Regulatory Asset Amortization Period	25 years
Kentucky Utilities Co [Member]
Asset Retirement Obligation [Roll Forward]
Balance at Beginning of Period	$ 288
Accretion	10
Effect of foreign exchange rates	0
Changes in estimated timing or cost	(51)
Obligations settled	(10)
Balance at End of Period	237
Increase (Decrease) to the asset retirement obligations due to revisions in the amounts and timing of future expected costs related to the closure of CCR impoundments	$ (56)
Kentucky Utilities Co [Member] \| Minimum [Member]
Asset Retirement Obligation [Roll Forward]
Regulatory Asset Amortization Period	10 years
Kentucky Utilities Co [Member] \| Maximum [Member]
Asset Retirement Obligation [Roll Forward]
Regulatory Asset Amortization Period	25 years

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.

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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 50
-Paragraph 1
-Subparagraph (c)(3)
-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
-Topic 410
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) asset retirement obligations.

+ References

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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.

+ References

+ Details

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- Definition

Amount of increase (decrease) in asset retirement obligations.

+ References

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

+ References

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)(4)
-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
-Topic 410
-SubTopic 20
-Section 35
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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