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Operating segments - additional information - Summary of non-current assets other than excluded items (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items $ 64,655 $ 71,063
Deferred tax assets 3,137 3,395
Other financial assets (including loans to equity accounted units) 814 510
Tax recoverable 8 30
Trade and other receivables 1,304 1,397
Total non-current assets 70,047 76,554
Quasi equity loans [member]    
Disclosure Of Geographical Areas [Line Items]    
Quasi equity loans to equity accounted units 129 159
Australia [Member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 28,592 32,890
Deferred tax assets 796 1,055
Canada [Member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 13,775 14,822
Deferred tax assets 545 546
Mongolia [Member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 9,912 8,582
Deferred tax assets 703 631
United States [Member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 4,815 4,812
Deferred tax assets 932 877
Africa [Member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 3,476 3,781
South America [Member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 3,047 3,304
Indonesia [member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items   1,458
Europe excluding France and the UK [member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 50 362
United Kingdom [Member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 59 66
France [member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 79 94
Other countries [Member]    
Disclosure Of Geographical Areas [Line Items]    
Non-current assets other than excluded items 850 892
Deferred tax assets $ 161 $ 286