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Cost Analysis - Summary of Depreciation, Amortisation and Impairment Analysis (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Continuing operations [member]      
Cost of sales and operating cost analysis [line items]      
Depreciation and depletion $ 1,691 $ 1,624 $ 1,613
Amortisation of intangible assets 74 70 64
Impairment of property, plant and equipment [1]   263 8
Impairment of intangible assets   410  
Total 1,765 2,367 1,685
Cost of sales [member]      
Cost of sales and operating cost analysis [line items]      
Depreciation and depletion 1,427 1,367 1,364
Impairment of property, plant and equipment [1]   254 6
Total 1,427 1,621 1,370
Cost of sales [member] | Continuing operations [member]      
Cost of sales and operating cost analysis [line items]      
Total [2] 1,427 1,621 1,370
Operating costs [member]      
Cost of sales and operating cost analysis [line items]      
Depreciation and depletion 264 257 249
Amortisation of intangible assets 74 70 64
Impairment of property, plant and equipment [1]   9 2
Impairment of intangible assets   410  
Total $ 338 $ 746 $ 315
[1] Total impairment charges for the year ended 31 December 2021 amounted to $nil million (2020: $827 million, including a charge of $154 million related to equity accounted investments as detailed in note 15; 2019: $8 million).
[2] Depreciation, amortisation and impairment analysis