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Purchases and sales of subsidiaries, joint ventures, associates and other interests in businesses - Additional information (Detail) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jul. 16, 2019
Dec. 21, 2018
Dec. 14, 2018
Aug. 01, 2018
Jun. 01, 2018
May 10, 2018
Sep. 01, 2017
May 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Acquisitions And Disposals [Line Items]                      
Purchased amount               $ 194.0      
Current trade receivables                 $ 2,097.0 $ 2,167.0  
Profit before taxation                 11,119.0 18,167.0 $ 12,816.0
Disposals of subsidiaries, joint ventures, unincorporated joint operations and associates                 (80.0) 7,733.0 $ 2,675.0
Expected unconditional royalty payments to be received                 124.0 158.0  
2018 Disposals [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Disposal amount       $ 1,700.0              
2017 disposals [Member] | Yancoal Australia Limited [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Disposal amount             $ 2,690.0        
Ownership interest in joint venture disposed             (100.00%)        
Cash consideration for disposal             $ 2,450.0     2,540.0  
Unconditional guaranteed royalty payments received                   110.0  
Unconditional guaranteed royalty received                 20.0 $ 90.0  
Expected unconditional royalty payments to be received             $ 240.0   $ 20.0    
Simfer Jersey Limited [Member] | Ordinary [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Percentage of purchased interest               53.00%      
Non-controlling interest (%), Subsidiary                 (47.00%)    
Simfer S.A. [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Percentage of purchased interest               4.25%      
Non-controlling interest (%), Subsidiary                   (45.05%)  
Simfer S.A. [Member] | Bottom of range [member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Percentage of purchased interest               42.80%      
Simfer S.A. [Member] | Top of range [member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Percentage of purchased interest               45.05%      
Rossing Uranium Limited [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Profit before taxation $ 289.0                    
Rossing Uranium Limited [Member] | 2019 Disposals [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Proportion of ownership interest disposed 68.62%                    
Disposal amount $ 6.5                    
Gains on disposals of projects                 $ (289.0)    
Cumulative currency translation losses from recycled currency translation reserves 212.0                    
Cash consideration for disposal $ 118.0                    
Whitehaven Coal Limited [Member] | 2018 Disposals [Member]                      
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 [Member] | Within 1 year [member] | 2018 Disposals [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Current trade receivables         $ 50.0            
Dunkerque Aluminium Smelter [Member]                      
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 [Member]                      
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 [Member] | Copper and Gold Revenues [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Revenues, net of capital contribution.   $ 107.0                  
Elysis [Member]                      
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 [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Ownership interest in joint venture disposed       (82.00%)              
Hail Creek [Member] | 2018 Disposals [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Ownership interest in joint venture disposed       82.00%              
Net proceeds disposal of project       $ 1,545.0              
Profit before taxation       $ 1,141.0              
Valeria Project [Member] | 2018 Disposals [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Ownership interest in joint venture disposed       (71.20%)              
Net proceeds disposal of project       $ 170.0              
Valeria Project [Member] | 2018 Disposals [Member] | Land and Investments [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Net proceeds disposal of project       87.0              
Profit before taxation       18.0              
Valeria Project [Member] | 2018 Disposals [Member] | Undeveloped Properties [Member]                      
Disclosure Of Acquisitions And Disposals [Line Items]                      
Cash received from disposals       83.0              
Profit before taxation       83.0              
Kestrel Underground Coal Mine [Member] | 2018 Disposals [Member]                      
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