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Acquisitions and Dispositions (Sale of Interest in Cove Point) (Narrative) (Detail) - USD ($) $ in Billions | 1 Months Ended
--- | ---
Dec. 31, 2019 | Oct. 31, 2019 | Dec. 31, 2018
Business Acquisition And Dispositions [Line Items] |  |  |
Cash consideration from sale of noncontrolling interest | $ 2.1 |  |
Cove Point [Member] |  |  |
Business Acquisition And Dispositions [Line Items] |  |  |
Ownership interest percentage of limited partner interests |  | 25.00% | 25.00%
Cash consideration from sale of noncontrolling interest |  | $ 2.1 |

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- Definition Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- Definition The cash inflow resulting from the sale of an interest in a corporate unit during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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