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Income and other taxes - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Egypt |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Non-capital loss carryforwards | $ 110 | $ 153
United States |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Deductible temporary differences for which no deferred tax asset is recognised | $ 384 | $ 415

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