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Stockholders' equity - Share buyback and treasury shares (Details)
R$ / shares in Units, $ / shares in Units, R$ in Millions, $ in Millions
 1 Months Ended 12 Months Ended
Feb. 24, 2022
shares
Oct. 28, 2021
USD ($)
shares
Oct. 28, 2021
BRL (R$)
shares
Apr. 01, 2021
USD ($)
shares
Apr. 01, 2021
BRL (R$)
shares
Feb. 28, 2022
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
BRL (R$)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2020
BRL (R$)
shares
Dec. 31, 2021
R$ / shares
shares
Disclosure of classes of share capital [line items]                      
Total number of outstanding shares       5.30% 5.30%            
Number of shares repurchased             291,184,500       291,184,500
Value of shares acquired       $ 5,281 R$ 27,642   $ 5,546 R$ 29,121      
Number of shares held in treasury cancelled             152,016,372 152,016,372      
Share Repurchased             291,184,500 291,184,500      
Treasury stocks                      
Disclosure of classes of share capital [line items]                      
Number of Treasury Shares Re-issued as Compensation             890,482 890,482 1,628,485 1,628,485  
Treasury shares utilized and canceled             $ 7 R$ 37 $ 14 R$ 68  
Cancellation of treasury shares.                      
Disclosure of classes of share capital [line items]                      
Number of shares held in treasury cancelled           133,418,347 152,016,372 152,016,372      
Value of shares held in treasury cancelled | $             $ 2,401        
Wholly-owned subsidiaries                      
Disclosure of classes of share capital [line items]                      
Total number of outstanding shares   4.10% 4.10%                
Number of shares repurchased   21,184,500 21,184,500                
Value of shares acquired   $ 264 R$ 1,479 2,273 12,068   $ 2,538 R$ 13,547      
Share Repurchased             152,166,153 152,166,153      
Vale S.A. International                      
Disclosure of classes of share capital [line items]                      
Value of shares acquired       $ 3,008 R$ 15,574   $ 3,008 R$ 15,574      
Share Repurchased             139,018,347 139,018,347      
Vale S.A. International | Cancellation of treasury shares.                      
Disclosure of classes of share capital [line items]                      
Number of shares held in treasury cancelled 133,418,347                    
Vale S.A. International | Wholly-owned subsidiaries                      
Disclosure of classes of share capital [line items]                      
Repurchased shares average price | (per share)             $ 19.04       R$ 100.01
Common share | Treasury stocks                      
Disclosure of classes of share capital [line items]                      
Share buyback program, number of shares authorized to be repurchased       270,000,000 270,000,000            
Adr | Wholly-owned subsidiaries                      
Disclosure of classes of share capital [line items]                      
Share buyback program, number of shares authorized to be repurchased   200,000,000 200,000,000