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Asset Retirement Obligations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Asset Retirement Obligation [Rollforward] |  |
Balance at Beginning of Period | $ 488 | $ 586
Accretion | 21 | 24
Changes in estimated cash flow or settlement date | (73) | (84)
Effect of foreign currency exchange rates | 4 | (9)
Obligations settled | (43) | (29)
Balance at End of Period | 397 | 488
LG And E And KU Energy LLC [Member] |  |
Asset Retirement Obligation [Rollforward] |  |
Balance at Beginning of Period | 433 | 535
Accretion | 20 | 22
Changes in estimated cash flow or settlement date | (54) | (95)
Obligations settled | (43) | (29)
Balance at End of Period | 356 | 433
Increase (Decrease) to the asset retirement obligation due to revisions in the amounts and timing of future expected costs related to the closure of CCR impoundments | (60) | 114
Louisville Gas And Electric Co [Member] |  |
Asset Retirement Obligation [Rollforward] |  |
Balance at Beginning of Period | 145 | 175
Accretion | 7 | 7
Changes in estimated cash flow or settlement date | (8) | (19)
Obligations settled | (23) | (18)
Balance at End of Period | 121 | 145
Increase (Decrease) to the asset retirement obligation due to revisions in the amounts and timing of future expected costs related to the closure of CCR impoundments | (8) | (24)
Kentucky Utilities Co [Member] |  |
Asset Retirement Obligation [Rollforward] |  |
Balance at Beginning of Period | 288 | 360
Accretion | 13 | 15
Changes in estimated cash flow or settlement date | (46) | (76)
Obligations settled | (20) | (11)
Balance at End of Period | 235 | 288
Increase (Decrease) to the asset retirement obligation due to revisions in the amounts and timing of future expected costs related to the closure of CCR impoundments | $ (52) | $ (90)

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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 + 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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- Details
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