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Principal joint ventures - Summary financial information for joint ventures by fair value (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure Of Joint Ventures [Line Items]      
Consolidated sales revenue $ 40,522 $ 40,030 $ 33,781
Depreciation and amortisation (4,015) (4,375) (4,794)
Finance costs (552) (848) (1,111)
Taxation (4,242) (3,965) (1,567)
Profit after tax for the year 13,925 8,851 4,776
Total comprehensive income for the year [1] 10,786 11,939 $ 4,713
– Non-current assets 70,047 76,554  
– Current assets 20,168 18,678  
– Non-current liabilities (30,261) (33,262)  
Net assets 49,823 51,115  
Cash and cash equivalents 10,773 10,550  
Minera Escondida Limitada [member]      
Disclosure Of Joint Ventures [Line Items]      
Consolidated sales revenue 7,580 6,037  
Depreciation and amortisation (1,727) (1,690)  
Other operating costs (3,230) (2,617)  
Operating profit 2,623 1,730  
Finance costs (163) (120)  
Taxation (873) (627)  
Profit after tax for the year 1,587 983  
Total comprehensive income for the year 1,587 983  
– Non-current assets 13,027 13,814  
– Current assets 2,413 2,760  
– Current liabilities (1,637) (1,727)  
– Non-current liabilities (4,460) (4,617)  
Net assets 9,343 10,230  
Cash and cash equivalents 697 460  
– current financial liabilities (230) (330)  
– non-current financial liabilities (2,763) (2,840)  
Dividends received from joint venture (Rio Tinto share) 786 780  
Sohar Aluminium Co. L.L.C. [member]      
Disclosure Of Joint Ventures [Line Items]      
Consolidated sales revenue 810 460  
Depreciation and amortisation (120) (145)  
Other operating costs (440) (205)  
Operating profit 250 110  
Finance costs (35) (35)  
Taxation (40)    
Profit after tax for the year 175 75  
Total comprehensive income for the year 175 75  
– Non-current assets 3,085 3,230  
– Current assets 340 305  
– Current liabilities (230) (205)  
– Non-current liabilities (955) (1,270)  
Net assets 2,240 2,060  
Cash and cash equivalents 15 95  
– current financial liabilities (100) (130)  
– non-current financial liabilities $ (795) $ (1,120)  
[1] Refer to Group statement of comprehensive income for further details. Adjustments to other reserves include currency translation attributable to owners of Rio Tinto, other than that arising on Rio Tinto Limited’s share capital.