Taxation - Expected expiration of tax losses (Details) - USD ($) $ in Millions |
Dec. 31, 2023 |
Jun. 30, 2023 |
Dec. 31, 2022 |
Jun. 30, 2022 |
|---|---|---|---|---|
| Disclosure Of Income Taxes [Line Items] | ||||
| Unused tax losses for which no deferred tax asset recognised | $ 74,680 | $ 76,323 | ||
| Australia | ||||
| Disclosure Of Income Taxes [Line Items] | ||||
| Unused tax losses for which no deferred tax asset recognised | $ 46,220 | $ 43,832 | ||
| Less than one year | ||||
| Disclosure Of Income Taxes [Line Items] | ||||
| Unused tax losses for which no deferred tax asset recognised | 1,496 | 1,034 | ||
| Between 1 and 5 years | ||||
| Disclosure Of Income Taxes [Line Items] | ||||
| Unused tax losses for which no deferred tax asset recognised | 1,475 | 3,257 | ||
| 5 years and later | ||||
| Disclosure Of Income Taxes [Line Items] | ||||
| Unused tax losses for which no deferred tax asset recognised | $ 71,709 | $ 72,032 |