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New and Amended Accounting Standards and Interpretations - Summary of Reconciliation of Operating Lease Commitments to Expected Total Lease Liability to be Recognised (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Disclosure of initial application of standards or interpretations [abstract]    
Operating lease commitments as at 30 June 2019 $ 1,905 $ 2,012
Add: Leases which did not meet the definition of a lease under IAS 17 700  
Add: Cost of reasonably certain extension options (undiscounted) 100  
Less: Components excluded from lease liability (undiscounted) (200)  
Less: Effect of discounting (200)  
Total additional lease liabilities recognised on transition $ 2,300