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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

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