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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

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