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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, 2019
Jun. 30, 2018
Defined benefit pension schemes/post-employment obligations [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Fair value of defined benefit scheme assets $ (648) $ (633)
Scheme deficit 290 257
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 290 257
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 632 616
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 306 274
Post-retirement medical schemes [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Scheme deficit 203 192
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 203 192
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 $ 203 $ 192