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Revenue - Summary of Revenue by Segment and Asset (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of reportable segments [line items]      
Revenue $ 44,288 $ 43,129 $ 35,740
Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,144 1,241 874
Crude oil [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 3,171 2,933 2,528
Natural gas [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 1,259 1,124 1,029
LNG [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 1,179 920 858
NGL [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 263 294 265
Other petroleum [member] | Petroleum [member]      
Disclosure of reportable segments [line items]      
Revenue 58 137 42
Only copper [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 10,215 12,059 7,323
Other metals [member] | Copper [member]      
Disclosure of reportable segments [line items]      
Revenue 623 722 619
Metallurgical coal [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 7,568 7,331 6,266
Thermal coal [member] | Coal [member]      
Disclosure of reportable segments [line items]      
Revenue 1,553 1,558 1,312
Nickel West [member] | Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue 1,193 1,297 950
Other revenue [member] | Group and unallocated items/eliminations [member]      
Disclosure of reportable segments [line items]      
Revenue $ 32 $ 32 $ 25