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Segment information (Tables) | 6 Months Ended
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Jun. 30, 2018
Segment Reporting [Abstract] |
Segment Results | Segment results are evaluated on the basis of operating income, and the information given below is based on information used for internal management reporting. Total operating revenue
(In $ millions) |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Floaters |  |  | 482 |  |  |  | 744 |
Jack-ups |  |  | 193 |  |  |  | 360 |
Other |  |  | 37 |  |  |  | 42 |
Total operating revenue |  |  | 712 |  |  |  | 1,146 |
Depreciation and amortization
(In $ millions) |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Floaters |  |  | 298 |  |  |  | 301 |
Jack-ups |  |  | 93 |  |  |  | 105 |
Total |  |  | 391 |  |  |  | 406 |
Operating loss - Net loss
(In $ millions) |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Floaters |  |  | (446 | ) |  |  | 95 |
Jack-ups |  |  | (167 | ) |  |  | (115 | )
Other |  |  | — |  |  |  | 3 |
Operating loss |  |  | (613 | ) |  |  | (17 | )
Unallocated items: |  |  |  |  |  |  |  |
Total financial items and other |  |  | 14 |  |  |  | (96 | )
Income taxes |  |  | (36 | ) |  |  | 12 |
Net loss |  |  | (635 | ) |  |  | (101 | )
Drilling units and Newbuildings - Total assets
(In $ millions) |  | June 30, 2018 |  |  | December 31, 2017 |
Floaters |  |  | 9,411 |  |  |  | 9,956 |
Jack-ups |  |  | 3,369 |  |  |  | 3,508 |
Total drilling units and newbuildings |  |  | 12,780 |  |  |  | 13,464 |
Unallocated items: |  |  |  |  |  |  |  |
Assets held for sale |  |  | — |  |  |  | 126 |
Investments in associated companies |  |  | 1,615 |  |  |  | 1,473 |
Marketable securities |  |  | 121 |  |  |  | 124 |
Cash and restricted cash |  |  | 1,218 |  |  |  | 1,359 |
Other assets |  |  | 1,311 |  |  |  | 1,436 |
Total assets |  |  | 17,045 |  |  |  | 17,982 |
Drilling units and Newbuildings - Capital expenditures
(In $ millions) |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Floaters |  |  | 93 |  |  |  | 54 |
Jack-ups |  |  | 24 |  |  |  | 12 |
Total |  |  | 117 |  |  |  | 66 |
Summary of Geographic Segment Data | The following information presents our revenues and fixed assets by geographic area: Revenues
(In US$ millions) |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Brazil |  |  | 188 |  |  |  | 197 |
Nigeria |  |  | 105 |  |  |  | 110 |
Angola |  |  | 100 |  |  |  | 249 |
Norway |  |  | 82 |  |  |  | 115 |
Saudi Arabia |  |  | 79 |  |  |  | 80 |
United States |  |  | 30 |  |  |  | 187 |
Others (1) |  |  | 128 |  |  |  | 208 |
Total |  |  | 712 |  |  |  | 1,146 |
(1) | Other countries represent countries in which we operate that individually had revenues representing less than 10% of total revenues earned for any of the periods presented.
Summary of Major Customers | We had the following customers with contract revenues greater than 10% in any of the periods presented:
(In US$ millions) |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Petroleo Brasileiro S.A (“Petrobras”) |  |  | 27 | % |  |  | 17 | %
Total S.A Group (“Total”) |  |  | 20 | % |  |  | 22 | %
Saudi Aramco |  |  | 12 | % |  |  | 8 | %
Exxon Mobil Corp (“Exxon”) |  |  | 11 | % |  |  | 7 | %
LLOG |  |  | 5 | % |  |  | 18 | %
Summary of Geographic Segment Data | Fixed assets – drilling units (1)
(In US$ millions) |  | As at June 30, 2018 |  |  | As at December 31, 2017 |
Brazil |  |  | 2,405 |  |  |  | 1,816 |
Norway |  |  | 2,331 |  |  |  | 2,258 |
Malaysia |  |  | 1,445 |  |  |  | 1,809 |
Spain |  |  | 1,344 |  |  |  | 2,016 |
United States |  |  | 1,239 |  |  |  | 1,266 |
Other (2) |  |  | 3,767 |  |  |  | 4,051 |
Total |  |  | 12,531 |  |  |  | 13,216 |
(1) | The fixed assets referred to in the table above exclude assets under construction. The countries in this table represent the location of the drilling unit at the end of the reporting period and are not necessarily indicative of the geographic distribution of the revenues or operating profits generated by the assets during the period. In most cases these locations are different to the country in which the Company that owns the drilling unit is registered.
(2) | “Other countries” represent countries in which we operate that individually had fixed assets representing less than 10% of total fixed assets for any of the periods presented.

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- Definition Tabular disclosure of the extent of the entity's reliance on its major customers, if revenues from transactions with a single external customer amount to 10 percent or more of entity revenues, including the disclosure of that fact, the total amount of revenues from each such customer, and the identity of the reportable segment or segments reporting the revenues. The entity need not disclose the identity of a major customer or the amount of revenues that each segment reports from that customer. For these purposes, a group of companies known to the entity to be under common control is considered a single customer, and the federal government, a state government, a local government such as a county or municipality, or a foreign government is each considered a single customer. + References No definition available. + Details
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- Definition Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8906-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8813-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8721-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e8736-108599 + Details
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