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Other disclosures - Subsidiaries financial information (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]        
Consolidated sales revenue $ 19,362 $ 20,722    
Profit after tax for the period 3,451 2,931    
– attributable to non-controlling interests 135 (1,199)    
– attributable to Rio Tinto 3,316 4,130    
Other comprehensive (loss)/income (1,141) (240)    
Total comprehensive income 2,310 [1] 2,691 [2]    
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
– attributable to non-controlling interests 4,432     4,710
– attributable to Rio Tinto 39,224     40,532
Cash flow from operations 5,628 6,389    
Dividends paid to holders of non-controlling interests in subsidiaries (215) (57)    
Borrowings 12,604     12,806
Goodwill 821     922
Iron Ore Company of Canada        
Disclosure of subsidiaries [line items]        
Consolidated sales revenue 1,011 1,027    
Profit after tax for the period 257 260    
– attributable to non-controlling interests 106 108    
– attributable to Rio Tinto 151 152    
Other comprehensive (loss)/income (91) 51    
Total comprehensive income 166 311    
Non-current assets 2,397     2,585
Current assets 741     610
Current liabilities (394)     (532)
Non-current liabilities (847)     (927)
Net assets 1,897     1,736
– attributable to non-controlling interests 787     718
– attributable to Rio Tinto 1,110     1,018
Cash flow from operations 403 509    
Dividends paid to holders of non-controlling interests in subsidiaries 0 (52)    
Energy Resources of Australia Limited        
Disclosure of subsidiaries [line items]        
Consolidated sales revenue 108 118    
Profit after tax for the period 27 36    
– attributable to non-controlling interests 6 11    
– attributable to Rio Tinto 21 25    
Other comprehensive (loss)/income 22 1    
Total comprehensive income 49 37    
Non-current assets 393     76
Current assets 270     258
Current liabilities (131)     (127)
Non-current liabilities (428)     (462)
Net assets 104     (255)
– attributable to non-controlling interests 19     0
– attributable to Rio Tinto 85     (255)
Cash flow from operations 17 23    
Dividends paid to holders of non-controlling interests in subsidiaries 0 0    
Turquoise Hill        
Disclosure of subsidiaries [line items]        
Consolidated sales revenue 409 735    
Profit after tax for the period (23) (2,054)    
– attributable to non-controlling interests (89) (1,413)    
– attributable to Rio Tinto 66 (641)    
Other comprehensive (loss)/income (2) 1    
Total comprehensive income (25) (2,053)    
Non-current assets 10,155     9,589
Current assets 1,793     2,449
Current liabilities (457)     (493)
Non-current liabilities (4,375)     (4,405)
Net assets 7,116     7,140
– attributable to non-controlling interests 2,240     2,369
– attributable to Rio Tinto 4,876     4,771
Cash flow from operations 29 287    
Dividends paid to holders of non-controlling interests in subsidiaries 0 0    
Robe River Mining Co Pty Ltd        
Disclosure of subsidiaries [line items]        
Consolidated sales revenue 734 614    
Profit after tax for the period 403 344    
– attributable to non-controlling interests 158 134    
– attributable to Rio Tinto 245 210    
Other comprehensive (loss)/income (88) (18)    
Total comprehensive income 315 326    
Non-current assets 2,979     2,945
Current assets 1,124     1,161
Current liabilities (705)     (204)
Non-current liabilities (365)     (376)
Net assets 3,033     3,526
– attributable to non-controlling interests 1,210     1,404
– attributable to Rio Tinto 1,823     2,122
Cash flow from operations 665 528    
Dividends paid to holders of non-controlling interests in subsidiaries (211) 0    
Other Companies And Eliminations        
Disclosure of subsidiaries [line items]        
Consolidated sales revenue 851 716    
Profit after tax for the period 424 338    
– attributable to non-controlling interests 0 0    
– attributable to Rio Tinto 424 338    
Other comprehensive (loss)/income (38) (11)    
Total comprehensive income 386 327    
Non-current assets 3,673     3,687
Current assets 2,668     2,531
Current liabilities (859)     (303)
Non-current liabilities (3,495)     (4,050)
Net assets 1,987     1,865
– attributable to non-controlling interests 0     0
– attributable to Rio Tinto 1,987     1,865
Cash flow from operations 1,066 920    
Dividends paid to holders of non-controlling interests in subsidiaries 0 0    
Robe river iron associates        
Disclosure of subsidiaries [line items]        
Consolidated sales revenue 1,585 1,330    
Profit after tax for the period 827 682    
– attributable to non-controlling interests 158 134    
– attributable to Rio Tinto 669 548    
Other comprehensive (loss)/income (126) (29)    
Total comprehensive income 701 653    
Non-current assets 6,652     6,632
Current assets 3,792     3,692
Current liabilities (1,564)     (507)
Non-current liabilities (3,860)     (4,426)
Net assets 5,020     5,391
– attributable to non-controlling interests 1,210     1,404
– attributable to Rio Tinto 3,810     3,987
Cash flow from operations 1,731 1,448    
Dividends paid to holders of non-controlling interests in subsidiaries (211) $ 0    
North Mining Limited | Robe river iron associates        
Disclosure of subsidiaries [line items]        
Goodwill 342     349
Amended and Restated Shareholders Agreement, Amended June 08, 2011 | Erdenes Oyu Tolgoi LLC        
Disclosure of subsidiaries [line items]        
Borrowings 1,327   $ 1,241  
Interest receivable $ 734     $ 655
Amended and Restated Shareholders Agreement, Amended June 08, 2011 | Erdenes Oyu Tolgoi LLC | Floating interest rate        
Disclosure of subsidiaries [line items]        
Borrowings, interest rate basis 6.50%      
[1] Refer to Group statement of comprehensive income for further details.
[2] Refer to Group statement of comprehensive income for further details.