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Financial instruments disclosures Summary of changes in fair value of Level 3 financial assets and financial liabilities (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of detailed information about financial instruments [line items]    
Currency translation adjustments [1] $ (269) $ 2,304
Level 3    
Disclosure of detailed information about financial instruments [line items]    
Opening balance 637  
Currency translation adjustments 2  
– net operating costs 8  
– net operating costs 17  
Total unrealised losses transferred into other comprehensive income (10)  
Additions 2  
Disposals/maturity of financial instruments (14)  
Closing balance 642  
Total gains included in the income statement for assets and liabilities held at end of period $ 11  
[1] US$31 million for the period ended 30 June 2019 (30 June 2018: loss of US$231 million) arising on Rio Tinto Limited’s share capital, which is recognised in the Group statement of changes in equity. Refer to Group statement of changes in equity on pages F-7 and F-8.