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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