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Share capital - Rio Tinto plc - Summary of share capital (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2024
£ / shares
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Disclosure of classes of share capital [line items]        
Ordinary shares issued | $ $ 0   $ 0 $ 0
– Rio Tinto plc        
Disclosure of classes of share capital [line items]        
Number of issued and fully paid up share capital beginning balance (in shares) 1,255,892,000   1,255,845,000 1,255,795,000
Issued and fully paid up share capital beginning balance | $ $ 207   $ 207 $ 207
Ordinary shares issued under the Global Employee Share plan (GESP) (in shares) 53,000.000   47,000.000 50,000.000
Shares purchased and cancelled (in shares) 0   0 0
Shares purchased and cancelled | $ $ 0   $ 0 $ 0
Number of shares held by public at beginning balance (in shares) 1,255,892,000   1,255,845,000  
Issued and fully paid up share capital ending balance | $ $ 207   $ 207 $ 207
Number of issued and fully paid up share capital ending balance (in shares) 1,255,945,000   1,255,892,000 1,255,845,000
Number of shares held by public at ending balance (in shares) 1,255,945,000   1,255,892,000 1,255,845,000
– Rio Tinto plc | Rio Tinto Plc Employee Share Based Payment Plans        
Disclosure of classes of share capital [line items]        
Exercise prices per share | £ / shares   £ 45.09    
Market value per share | £ / shares   £ 58.99    
– Rio Tinto plc | Shares held by public        
Disclosure of classes of share capital [line items]        
Ordinary shares issued under the Global Employee Share plan (GESP) (in shares) 53,000.000   47,000.000 50,000.000
Shares purchased and cancelled (in shares) 0   0 0
Number of shares held by public at beginning balance (in shares) 1,251,321,000   1,249,655,000 1,248,141,000
Shares reissued from treasury under the GESP (in shares) 1,548,000   1,619,000 1,464,000
Number of shares held (in shares) 3,023,000.000 3,023,000.000 4,571,000 6,190,000
Number of shares held by public at ending balance (in shares) 1,252,922,000   1,251,321,000 1,249,655,000
– Rio Tinto plc | Special voting share        
Disclosure of classes of share capital [line items]        
Other share classes 1 only   1 only 1 only
– Rio Tinto plc | DLC dividend share        
Disclosure of classes of share capital [line items]        
Other share classes 1 only   1 only 1 only