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Accumulated other comprehensive income (Tables) | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income | Accumulated other comprehensive income as at June 30, 2018 and December 31, 2017 was as follows:
(In $ millions) |  | Unrealized gain on marketable securities |  |  | Unrealized gain on foreign exchange |  |  | Actuarial (loss) / gain relating to pension |  |  | Share in unrealized gain from associated companies |  |  | Change in unrealized gain on interest rate swaps in VIEs |  |  | Change in conversion option on Archer debt facility |  |  | Total |
Beginning balance, December 31, 2017 |  |  | 31 |  |  |  | 36 |  |  |  | (26 | ) |  |  | 15 |  |  |  | 2 |  |  |  | — |  |  |  | 58 |
Adoption of accounting standard update |  |  | (31 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (31 | )
Beginning balance, January 1, 2018 |  |  | — |  |  |  | 36 |  |  |  | (26 | ) |  |  | 15 |  |  |  | 2 |  |  |  | — |  |  |  | 27 |
Other comprehensive income before reclassifications |  |  | — |  |  |  | — |  |  |  | 1 |  |  |  | 11 |  |  |  | — |  |  |  | 2 |  |  |  | 14 |
Ending balance, June 30, 2018 |  |  | — |  |  |  | 36 |  |  |  | (25 | ) |  |  | 26 |  |  |  | 2 |  |  |  | 2 |  |  |  | 41 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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