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Asset Retirement Obligations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2017
Asset Retirement Obligation [Roll Forward] |  |
Balance at Beginning of Period |  | $ 488
Accretion |  | 11
Effect of foreign exchange rates |  | 2
Changes in estimated timing or cost |  | (73)
Obligations settled |  | (12)
Balance at End of Period | $ 416 | $ 416
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 |  | 10
Effect of foreign exchange rates |  | 0
Changes in estimated timing or cost |  | (66)
Obligations settled |  | (12)
Balance at End of Period | 365 | 365
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) | $ (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 |  | 4
Effect of foreign exchange rates |  | 0
Changes in estimated timing or cost |  | (10)
Obligations settled |  | (7)
Balance at End of Period | 132 | 132
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) | $ (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 |  | 6
Effect of foreign exchange rates |  | 0
Changes in estimated timing or cost |  | (56)
Obligations settled |  | (5)
Balance at End of Period | 233 | 233
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) | $ (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

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- Definition 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. + 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) -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 + Details
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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 + Details
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- Definition Amount of foreign currency translation gain (loss) which decreases (increases) asset retirement obligations. + 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) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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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 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)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of increase (decrease) in asset retirement obligations. + 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) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition 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 + Details
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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. + Details
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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. + Details
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