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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | $ 3,258 | $ 3,060
Effect of foreign currency exchange rates | (149) | 198
Goodwill recognized during the period | 53 | 0
Balance at end of period | 3,162 | 3,258
U.K. Regulated [Member] |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | 2,596 | 2,398
Effect of foreign currency exchange rates | (149) | 198
Goodwill recognized during the period | 0 | 0
Balance at end of period | 2,447 | 2,596
Kentucky Regulated [Member] |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | 662 | 662
Goodwill recognized during the period | 0 | 0
Balance at end of period | 662 | 662
Corporate And Other [Member] |  |
Changes in the Carrying Amount of Goodwill by Segment [Roll Forward] |  |
Balance at beginning of period | 0 | 0
Goodwill recognized during the period | 53 | 0
Balance at end of period | $ 53 | $ 0

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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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + 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://fasb.org/us-gaap/role/ref/legacyRef -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Details
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