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Deferred Taxation - Recognised and unrecognised amounts in deferred tax assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised $ 3,395 $ 3,728
Unrecognised 3,676 3,442
France [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised   330
Unrecognised 1,163 1,077
Canada [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 546 470
Unrecognised 674 707
United States [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 877 1,239
Unrecognised 7 6
Australia [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 1,055 1,072
Unrecognised 257 446
Mongolia [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 631 441
Unrecognised 61  
Other countries [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 286 176
Unrecognised $ 1,514 $ 1,206