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Purchases and sales of subsidiaries, joint ventures, associates and other interests in businesses - Additional information (Detail) - USD ($)
$ in Millions
 2 Months Ended 12 Months Ended
Jul. 16, 2019
Dec. 21, 2018
Dec. 14, 2018
Aug. 01, 2018
Jun. 01, 2018
Sep. 01, 2017
Feb. 26, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Acquisitions And Disposals [Line Items]                      
Current trade receivables               $ 2,543.0 $ 2,097.0    
Profit before taxation               15,391.0 11,119.0 $ 18,167.0  
Disposals of subsidiaries, joint ventures, unincorporated joint operations and associates               10.0 (80.0) 7,733.0  
Expected unconditional royalty payments to be received               113.0 124.0    
Discontinued operations                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Disposal amount       $ 1,700.0              
Discontinued operations | Yancoal Australia Limited                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Disposal amount           $ 2,690.0          
Cash consideration for disposal           $ 2,450.0         $ 2,540.0
Ownership interest in joint venture disposed           (100.00%)          
Expected unconditional royalty payments to be received           $ 240.0   $ 10.0      
Unconditional guaranteed royalty payments received                     $ 110.0
Unconditional guaranteed royalty received                 20.0 90.0  
Discontinued operations | Yancoal Australia Limited | Cash proceeds from previous business combination                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Expected unconditional royalty payments to be received             $ 10.0        
Rossing Uranium Limited                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Profit before taxation $ 289.0                    
Rossing Uranium Limited | Discontinued operations                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Proportion of ownership interest disposed 68.62%                    
Disposal amount $ 6.5                    
Cash consideration for disposal 118.0                    
Losses on disposals of investments 289.0                    
Cumulative currency translation losses from recycled currency translation reserves $ 212.0                    
Whitehaven Coal Limited | Discontinued operations                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Disposal amount         $ 200.0            
Ownership interest in joint venture disposed         (75.00%)            
Cash received from disposals         $ 150.0            
Gains on disposals of projects         195.0            
Whitehaven Coal Limited | Due within 1 year | Discontinued operations                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Current trade receivables         $ 50.0            
Dunkerque Aluminium Smelter                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Disposal amount     $ 500.0                
Profit before taxation     $ 128.0                
Proceeds from sale of a business                   385.0  
Grasberg                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Disposal amount   $ 3,500.0                  
Gains on disposals of projects   2,146.0                  
Disposals of subsidiaries, joint ventures, unincorporated joint operations and associates   3,392.0                  
Grasberg | Copper and Gold Revenues                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Revenues, net of capital contribution.   $ 107.0                  
Elysis                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Cash investment in joint venture                   5.0  
Fare value of patents                   171.0  
Fair value of intellectual property                   $ 141.0  
Hail Creek                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Ownership interest in joint venture disposed       (82.00%)              
Hail Creek | Discontinued operations                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Ownership interest in joint venture disposed       82.00%              
Net proceeds disposal of project       $ 1,545.0         $ 26.0    
Profit before taxation       $ 1,141.0              
Valeria Project | Discontinued operations                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Ownership interest in joint venture disposed       (71.20%)              
Net proceeds disposal of project       $ 170.0              
Valeria Project | Discontinued operations | Land and Investments                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Net proceeds disposal of project       87.0              
Profit before taxation       18.0              
Valeria Project | Discontinued operations | Undeveloped Properties                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Cash received from disposals       83.0              
Profit before taxation       83.0              
Kestrel Underground Coal Mine | Discontinued operations                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Disposal amount       $ 2,250.0              
Ownership interest in joint venture disposed       (80.00%)              
Net proceeds disposal of project       $ 2,270.0              
Profit before taxation       $ 1,010.0