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Investments Accounted for Using the Equity Method - Summary of Movements of Investments Accounted for using the Equity Method (Parenthetical) (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 28, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of significant investments in associates and joint ventures [line items]        
Impairment of the carrying value of the investment in Cerrejón   $ 2,635 $ 494 $ 264
Profit/(loss) from equity accounted investments, related impairments and expenses   (921) (512) (546)
Funding provided during the period   (219)    
Fair value change on forward exchange derivatives   (145) $ (422) (8)
Consideration on sale of investments accounted for using equity method       $ 10,427
Carbonesdel Cerrejon Limited Liability Corporation [Member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Impairment of the carrying value of the investment in Cerrejón   466    
Percentage of divestiture of interest in associates accounted for using equity method 33.30%      
Consideration on sale of investments accounted for using equity method $ 294      
Carbonesdel Cerrejon Limited Liability Corporation [Member] | Non-current assets held for sale [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Investments in associates accounted for using equity method   284    
Samarco dam failure [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Fair value change on forward exchange derivatives   136    
Samarco germano dam decommissioning [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Change in estimate   6    
Exchange translation   (21)    
Samarco Germano dam decommissioning   (15)    
Joint ventures [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Profit/(loss) from equity accounted investments, related impairments and expenses   (990)    
Funding provided during the period   (111)    
Joint ventures [member] | Samarco dam failure [member]        
Disclosure of significant investments in associates and joint ventures [line items]        
Profit/(loss) from equity accounted investments, related impairments and expenses   990    
Funding provided during the period   (111)    
Samarco dam failure provision   (1,000)    
Change in estimate   (842)    
Exchange translation   (158)    
Impairment funding provided   $ (111)