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Other disclosures - Summary financial information for joint ventures by fair value (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Disclosure of joint ventures [line items]      
Consolidated sales revenue $ 19,362 $ 20,722  
Depreciation and amortisation (2,092) (2,096)  
Finance costs [1] (169) (273)  
Taxation (1,828) (2,255)  
Profit after tax for the period 3,451 2,931  
Other comprehensive (loss)/income (1,141) (240)  
Total comprehensive income 2,310 [2] 2,691 [3]  
Non-current assets 69,376   $ 70,499
Current assets 15,153   17,303
Current liabilities (9,400)   (11,125)
Non-current liabilities (31,473)   (31,435)
Net assets 43,656   45,242
Cash and cash equivalents 6,269 6,861 8,027
Minera Escondida Limitada      
Disclosure of joint ventures [line items]      
Consolidated sales revenue 3,137 3,537  
Depreciation and amortisation (797) (790)  
Other operating costs (1,243) (1,640)  
Operating profit 1,097 1,107  
Finance costs (70) (80)  
Taxation (370) (387)  
Profit after tax for the period 657 640  
Other comprehensive (loss)/income (27) 0  
Total comprehensive income 630 640  
Non-current assets 12,004   12,450
Current assets 2,393   2,250
Current liabilities (1,547)   (1,827)
Non-current liabilities (4,540)   (4,670)
Net assets 8,310   8,203
Cash and cash equivalents 533   603
– current financial liabilities (783)   (807)
– non-current financial liabilities (2,217)   (2,380)
Dividends received from joint venture (Rio Tinto share) 183 315  
Sohar Aluminium Co. L.L.C.      
Disclosure of joint ventures [line items]      
Consolidated sales revenue 325 325  
Depreciation and amortisation (55) (60)  
Other operating costs (225) (220)  
Operating profit 45 45  
Finance costs (15) (15)  
Taxation (5) (5)  
Profit after tax for the period 25 25  
Other comprehensive (loss)/income 0 0  
Total comprehensive income 25 25  
Non-current assets 2,990   3,045
Current assets 250   290
Current liabilities (185)   (205)
Non-current liabilities (745)   (845)
Net assets 2,310   2,285
Cash and cash equivalents 20   20
– current financial liabilities (110)   (110)
– non-current financial liabilities (575)   $ (675)
Dividends received from joint venture (Rio Tinto share) $ 0 $ 0  
[1] Finance costs in the income statement include hedging adjustments and are net of amounts capitalised of US$175 million (30 June 2019: US$166 million).
[2] Refer to Group statement of comprehensive income for further details.
[3] Refer to Group statement of comprehensive income for further details.