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Property, Plant and Equipment - Additional Information (Detail) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 31, 2017 USD ($) | Sep. 30, 2017 Rig | Jun. 30, 2017 USD ($) Rig | Sep. 30, 2016 USD ($)
Diamond Offshore [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Asset impairment charge, before tax and noncontrolling interests |  |  | $ 72 | $ 672
Asset impairment charge, net of tax and noncontrolling interests |  |  | $ 23 | $ 263
Diamond Offshore [Member] | Drilling Rigs [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of rigs evaluated for impairment | Rig |  | 6 | 7 |
Diamond Offshore [Member] | Ultra Deepwater [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of rigs impaired | Rig |  |  | 1 |
Diamond Offshore [Member] | Deepwater Semisubmersible Rigs [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Number of rigs impaired | Rig |  |  | 1 |
Boardwalk Pipeline [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Proceed from sale of plant and equipment | $ 64 |  |  |
Gain (loss) on sale of plant and equipment | (47) |  |  |
Gain (loss) on sale of plant and equipment,net of tax and noncontrolling interests | $ (15) |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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