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Deferred Taxation - Recognised and unrecognised amounts in deferred tax assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised $ 3,137 $ 3,395
Unrecognised 2,510 3,676
France [member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Unrecognised 1,122 1,163
Canada [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 545 546
Unrecognised 559 674
United States [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 932 877
Unrecognised 12 7
Australia [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 796 1,055
Unrecognised 289 257
Mongolia [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 703 631
Unrecognised 87 61
Other countries [Member]    
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Recognised 161 286
Unrecognised $ 441 $ 1,514