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Revenue - Summary of Revenue by Segment and Asset (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of reportable segments [line items]      
Revenue $ 42,931 $ 44,288 $ 43,129
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,156 1,144 1,241
Crude oil [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 2,033 3,171 2,933
Natural gas [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 980 1,259 1,124
LNG [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 774 1,179 920
NGL [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 198 263 294
Other petroleum [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 85 58 137
Only copper [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 10,044 10,215 12,059
Other metals [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 622 623 722
Metallurgical coal [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 5,311 7,568 7,331
Thermal coal [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 931 1,553 1,558
Nickel West [member] | Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,189 1,193 1,297
Other revenue [member] | Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue $ 30 $ 32 $ 32