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Earnings per share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Summary of Earnings Per Share | The components of the numerator for the calculation of basic and diluted EPS are as follows:
(In $ millions) |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Net loss |  |  | (477 | ) |  |  | (78 | )
Less: Allocation to participating securities |  |  | — |  |  |  | — |
Net loss available to shareholders |  |  | (477 | ) |  |  | (78 | )
Effect of dilution |  |  | — |  |  |  | — |
Diluted net loss available to shareholders |  |  | (477 | ) |  |  | (78 | )
The components of the denominator for the calculation of basic and diluted EPS are as follows:
(In millions) |  | Six Months Ended June 30, |
|  | 2018 |  |  | 2017 |
Basic earnings per share: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  |  | 504 |  |  |  | 504 |
Diluted earnings per share: |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding |  |  | 504 |  |  |  | 504 |
Effect of dilutive share options (1) |  |  | — |  |  |  | — |
Effect of dilutive convertible bonds |  |  | — |  |  |  | — |
Weighted average number of common shares outstanding adjusted for the effects of dilution |  |  | 504 |  |  |  | 504 |
Basic (loss)/income per share (US dollar) |  |  | (0.95 | ) |  |  | (0.16 | )
Diluted (loss)/income per share (US dollar) |  |  | (0.95 | ) |  |  | (0.16 | )
(1) | Certain stock options have been excluded from the calculation of diluted EPS because their exercise price exceeded our average share price during the calculation period.

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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