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Operating segments - additional information - Summary of non-current assets other than excluded items (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items $ 70,680 $ 65,198
Deferred tax assets 3,385 3,102
Other financial assets 829 635
Loans to equity accounted units 112 113
Tax recoverable 4 5
Receivables and other assets 1,525 1,446
Total non-current assets 76,535 70,499
Non-current assets    
Disclosure of geographical areas [line items]    
Investments in equity accounted units 3,652 3,858
Quasi equity loans to equity accounted units    
Disclosure of geographical areas [line items]    
Loans to equity accounted units 112 113
Non-quasi equity loan    
Disclosure of geographical areas [line items]    
Non-current quasi equity loans 1 39
Australia    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 32,290 27,944
Deferred tax assets 649 698
Canada    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 14,666 14,644
Deferred tax assets 617 492
Mongolia    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 10,285 9,187
Deferred tax assets 974 704
United States of America    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 6,090 5,459
Deferred tax assets 938 920
Africa    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 3,294 3,583
South America    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 2,718 2,652
Europe (excluding France and the UK)    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 157 193
UK    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 117 158
France    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 55 64
Deferred tax assets 0 0
Other countries    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 1,008 1,314
Deferred tax assets $ 207 $ 288