XML 142 R166.htm IDEA: XBRL DOCUMENT v3.20.2
Pension and Other Post-retirement Obligations - Summary of Net Liability Recognised in Consolidated Balance Sheet (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Defined benefit pension schemes/post-employment obligations [member]    
Disclosure of net defined benefit liability (asset) [line items]    
Fair value of defined benefit scheme assets $ (634) $ (648)
Scheme deficit 333 290
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 333 290
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 613 632
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 354 306
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 214 203
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 214 203
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 $ 214 $ 203