Pension and Other Post-retirement Obligations - Summary of Net Liability Recognised in Consolidated Balance Sheet (Detail) - USD ($)
$ in Millions |
Jun. 30, 2021 |
Jun. 30, 2020 |
| Defined benefit pension schemes / post- employment obligations [member] |
|
|
| Disclosure of net defined benefit liability (asset) [line items] |
|
|
| Fair value of defined benefit scheme assets |
$ (398)
|
$ (634)
|
| Scheme deficit |
337
|
333
|
| Unrecognised surplus |
0
|
0
|
| Unrecognised past service credits |
0
|
0
|
| Adjustment for employer contributions tax |
0
|
0
|
| Net liability recognised in the Consolidated Balance Sheet |
337
|
333
|
| Defined benefit pension schemes / post- employment obligations [member] | Funded defined benefit obligation [member] |
|
|
| Disclosure of net defined benefit liability (asset) [line items] |
|
|
| Present value of defined benefit obligation |
377
|
613
|
| Defined benefit pension schemes / post- employment obligations [member] | Unfunded defined benefit obligation [member] |
|
|
| Disclosure of net defined benefit liability (asset) [line items] |
|
|
| Present value of defined benefit obligation |
358
|
354
|
| Post-retirement medical schemes [member] |
|
|
| Disclosure of net defined benefit liability (asset) [line items] |
|
|
| Fair value of defined benefit scheme assets |
0
|
0
|
| Scheme deficit |
197
|
214
|
| Unrecognised surplus |
0
|
0
|
| Unrecognised past service credits |
0
|
0
|
| Adjustment for employer contributions tax |
0
|
0
|
| Net liability recognised in the Consolidated Balance Sheet |
197
|
214
|
| Post-retirement medical schemes [member] | Funded defined benefit obligation [member] |
|
|
| Disclosure of net defined benefit liability (asset) [line items] |
|
|
| Present value of defined benefit obligation |
0
|
0
|
| Post-retirement medical schemes [member] | Unfunded defined benefit obligation [member] |
|
|
| Disclosure of net defined benefit liability (asset) [line items] |
|
|
| Present value of defined benefit obligation |
$ 197
|
$ 214
|