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Principal joint ventures - Summary financial information for joint ventures that are material to the Group (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Joint Ventures [Line Items]      
Consolidated sales revenue $ 40,030 $ 33,781 $ 34,829
Depreciation and amortisation (4,375) (4,794) (4,645)
Finance costs (848) (1,111) (750)
Taxation (3,965) (1,567) (993)
Profit/(loss) after tax for the year 8,851 4,776 (1,719)
Total comprehensive income/(loss) for the year [1] 11,939 4,713 $ (3,749)
– Non-current assets 76,554 74,177  
– Current assets 18,678 15,055  
– Current liabilities (11,225) (9,362)  
– Non-current liabilities (33,262) (34,133)  
Net assets 51,115 45,730  
Cash and cash equivalents 10,550 8,201  
Minera Escondida Limitada [member]      
Disclosure Of Joint Ventures [Line Items]      
Consolidated sales revenue 6,037 4,883  
Depreciation and amortisation (1,690) (1,213)  
Other operating costs (2,617) (2,199)  
Operating profit 1,730 1,471  
Finance costs (120) (47)  
Taxation (627) (517)  
Profit/(loss) after tax for the year 983 907  
Total comprehensive income/(loss) for the year 983 907  
– Non-current assets 13,814 14,947  
– Current assets 2,760 2,257  
– Current liabilities (1,727) (1,403)  
– Non-current liabilities (4,617) (4,112)  
Net assets 10,230 11,689  
Cash and cash equivalents 460 443  
Current financial liabilities (330) (467)  
Non-current financial liabilities (2,840) (2,643)  
Dividends received from joint venture (Rio Tinto share) 780 210  
Sohar Aluminium Co. L.L.C. [member]      
Disclosure Of Joint Ventures [Line Items]      
Consolidated sales revenue 460 610  
Depreciation and amortisation (145) (130)  
Other operating costs (205) (425)  
Operating profit 110 55  
Finance costs (35) (25)  
Profit/(loss) after tax for the year 75 30  
Total comprehensive income/(loss) for the year 75 30  
– Non-current assets 3,230 3,275  
– Current assets 305 255  
– Current liabilities (205) (45)  
– Non-current liabilities (1,270) (1,505)  
Net assets 2,060 1,980  
Cash and cash equivalents 95 20  
Current financial liabilities (130) (100)  
Non-current financial liabilities $ (1,120) $ (1,230)  
[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 share capital.