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Operating segments - additional information - Summary of non-current assets other than excluded items (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items $ 72,825 $ 70,680
Deferred tax assets 3,375 3,385
Other financial assets 528 829
Quasi equity loans to equity accounted units 97 112
Tax recoverable 29 4
Receivables and other assets 1,610 1,525
Total non-current assets 78,464 76,535
Quasi equity loans to equity accounted units    
Disclosure of geographical areas [line items]    
Quasi equity loans to equity accounted units 97 112
Non-quasi equity loan    
Disclosure of geographical areas [line items]    
Non-current loans to equity accounted units 0 1
Non-current assets    
Disclosure of geographical areas [line items]    
Investments in equity accounted units 3,407 3,652
Australia    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 32,807 32,290
Deferred tax assets 787 649
Canada    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 15,139 14,666
Deferred tax assets 545 617
Mongolia    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 11,653 10,285
Deferred tax assets 954 974
United States of America    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 6,141 6,090
Deferred tax assets 851 938
Africa    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 3,080 3,294
South America    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 2,451 2,718
Europe (excluding UK)    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 246 212
UK    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 111 117
Other countries    
Disclosure of geographical areas [line items]    
Non-current assets other than excluded items 1,197 1,008
Deferred tax assets $ 238 $ 207