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Property plant and equipment (Tables) | 6 Months Ended
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Jun. 30, 2018
Drilling Unit [Member] |
Property plant and equipment |
(In $ millions) |  | As at June 30, 2018 |  |  | As at December 31, 2017 |
Cost |  |  | 17,452 |  |  |  | 17,335 |
Accumulated depreciation |  |  | (4,507 | ) |  |  | (4,119 | )
Impairment |  |  | (414 | ) |  |  | — |
Net book value |  |  | 12,531 |  |  |  | 13,216 |
Newbuildings [Member] |
Property plant and equipment |
(In $ millions) |  | As at June 30, 2018 |  |  | As at December 31, 2017 |
Total Newbuildings |  |  | 249 |  |  |  | 248 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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