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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | $ 3,060 | $ 3,550
Effect of foreign currency exchange rates | 198 | (490)
Balance at end of period | 3,258 | 3,060
U.K. Regulated [Member] |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | 2,398 | 2,888
Effect of foreign currency exchange rates | 198 | (490)
Balance at end of period | 2,596 | 2,398
Kentucky Regulated [Member] |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | 662 | 662
Balance at end of period | 662 | 662
LG And E And KU Energy LLC [Member] |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | 996 |
Balance at end of period | 996 | 996
Louisville Gas And Electric Co [Member] |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | 389 |
Balance at end of period | 389 | 389
Kentucky Utilities Co [Member] |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | 607 |
Balance at end of period | $ 607 | $ 607

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 + 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 Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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