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Borrowings and other financial liabilities - Summary of detailed information about borrowings (Parenthetical) (Detail)
€ in Millions, $ in Millions
 12 Months Ended
May 11, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Disclosure of detailed information about borrowings [Line Items]        
Notional amount   $ 1,522 $ 1,656  
Cumulative amount utilised from debt issuance   1,200 1,600  
Carrying value of bonds   1,300 1,600  
Buy-back of bonds       $ 1,900
Repayments of borrowings, classified as financing activities [1]   $ 721 203 $ 2,300
Increase in stated percentage   1.00%    
Borrowings   $ 13,831 14,115  
Debt instrument restrictive covenants   4,500 4,500  
Rio Tinto Finance plc Euro Bonds 2.0% due 2020        
Disclosure of detailed information about borrowings [Line Items]        
Buy-back of bonds | € € 402      
Repayments of borrowings, classified as financing activities   526    
Borrowings   0 455  
European debt issuance programme        
Disclosure of detailed information about borrowings [Line Items]        
Notional amount   $ 10,000 $ 10,000  
[1] On 11 May 2020, we repaid our €402 million (nominal value) Rio Tinto Finance plc Euro Bonds on their maturity. The cash outflow relating to the repayment of the bonds and the realised loss on the derivatives have been recognised within "Repayment of borrowings and associated derivatives" in the Group cash flow statement and totalled US$526 million.