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Asset Impairment Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 0 | $ 74 |  | $ 116 | $ 166
Kilroot and Ballylumford [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 0 | 0 |  | 115 | 0
Assets Carrying Amount Disclosure Nonrecurring | 114 |  |  | 114 |
Shady Point [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | 0 | 73 | $ 83 | 0 | 156
Assets Carrying Amount Disclosure Nonrecurring |  | 55 | $ 127 |  | 55
Other Subsidiaries [Member] |  |  |  |  |
Asset Impairment Expense [Line Items] |  |  |  |  |
Impairment of Long-Lived Assets Held-for-use | $ 0 | $ 1 |  | $ 1 | $ 10

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- Definition This element represents the aggregate carrying amount of the assets measured at fair value on a nonrecurring basis by the entity before the recognition of impairment charges. + References No definition available. + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2921-110230 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 220 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=114873921&loc=SL114875236-224282 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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