Interests in Joint Operations - Summary of Significant Interests in Joint Operations (Parenthetical) (Detail) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Jun. 30, 2021 |
Nov. 06, 2020 |
|
| Disclosure of joint operations [line items] | ||
| Percentage of ownership interests in joint operations | 50.00% | |
| Acquisition of additional proportion of ownership interest In joint operation | 28.00% | |
| Shenzi [member] | ||
| Disclosure of joint operations [line items] | ||
| Acquisition of additional proportion of ownership interest In joint operation | 28.00% | |
| Purchase price | $ 480 | |
| Goodwill recognized | 0 | |
| Property, plant and equipment recognised as of acquisition date | 642 | |
| Inventory recognised as of acquisition date | 17 | |
| Rehabilitation liabilities as of acquisition date | $ 179 |