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Other disclosures - Summary financial information for joint ventures by fair value (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disclosure of joint ventures [line items]      
Revenue $ 33,083 $ 19,362  
Depreciation and amortisation (2,307) (2,092)  
Finance expense [1] (91) (169)  
Taxation (4,981) (1,828)  
Profit after tax for the period 13,068 3,451  
Other comprehensive income/(loss) 35 (1,141)  
Total comprehensive income 13,103 [2] 2,310 [3]  
Non-current assets 77,676   $ 76,535
Current assets 25,765   20,855
Current liabilities (12,076)   (11,607)
Non-current liabilities (33,196)   (33,880)
Net assets 58,169   51,903
Cash and cash equivalents 14,027 6,269 10,381
Deferred tax liabilities 3,501   3,239
Investment in equity accounted units      
Disclosure of joint ventures [line items]      
Deferred tax liabilities 334   358
Minera Escondida Limitada      
Disclosure of joint ventures [line items]      
Revenue 4,953 3,137  
Depreciation and amortisation (580) (797)  
Other operating costs (1,506) (1,243)  
Operating profit 2,867 1,097  
Finance expense (73) (70)  
Taxation (1,034) (370)  
Profit after tax for the period 1,760 657  
Other comprehensive income/(loss) 40 (27)  
Total comprehensive income 1,800 630  
Non-current assets 11,710   11,833
Current assets 3,010   3,107
Current liabilities (1,777)   (1,813)
Non-current liabilities (4,796)   (4,560)
Net assets 8,147   8,567
Cash and cash equivalents 887   1,103
– current financial liabilities (577)   (790)
– non-current financial liabilities (2,800)   (2,560)
Dividends received from joint venture (Rio Tinto share) 720 183  
Sohar Aluminium Co. L.L.C.      
Disclosure of joint ventures [line items]      
Revenue 420 325  
Depreciation and amortisation (60) (55)  
Other operating costs (245) (225)  
Operating profit 115 45  
Finance expense (10) (15)  
Taxation (15) (5)  
Profit after tax for the period 90 25  
Other comprehensive income/(loss) 0 0  
Total comprehensive income 90 25  
Non-current assets 1,805   1,850
Current assets 420   270
Current liabilities (150)   (675)
Non-current liabilities (745)   (200)
Net assets 1,330   1,245
Cash and cash equivalents 145   30
– current financial liabilities (55)   (565)
– non-current financial liabilities (575)   $ (30)
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$174 million (30 June 2020: US$175 million).
[2] Refer to Group statement of comprehensive income for further details.
[3] Refer to Group statement of comprehensive income for further details.