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Deferred Taxation - Recognised and unrecognised amounts in deferred tax assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Recognised $ 3,102 $ 3,137 $ 3,137
Unrecognised 3,162 2,510 $ 2,510
France [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Recognised 0 0  
Unrecognised 1,111 1,122  
Canada [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Recognised 492 545  
Unrecognised 566 559  
United States of America [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Recognised 920 932  
Unrecognised 51 12  
Australia [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Recognised 698 796  
Unrecognised 316 289  
Mongolia [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Recognised 704 703  
Unrecognised 721 87  
Other countries [Member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Recognised 288 161  
Unrecognised $ 397 $ 441