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Revenue - Summary of Revenue by Segment and Asset (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of reportable segments [line items]      
Revenue $ 60,817 $ 42,931 $ 44,288
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,516 1,156 1,144
Crude oil [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 2,013 2,033 3,171
Natural gas [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 977 980 1,259
LNG [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 682 774 1,179
NGL [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 212 198 263
Other petroleum [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 62 85 58
Only copper [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 14,812 10,044 10,215
Other metals [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 914 622 623
Metallurgical coal [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 4,260 5,311 7,568
Thermal coal [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 894 931 1,553
Nickel West [member] | Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,545 1,189 1,193
Other revenue [member] | Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue $ 22 $ 30 $ 32