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Exceptional Items - Summary of Exceptional Items Related to the US Tax Reform (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of exceptional items [line items]      
Taxation (income) charges related to exceptional items $ 242 $ (2,320) $ (243)
US tax reform [member]      
Disclosure of exceptional items [line items]      
Re-measurement of deferred taxes as a result of reduced US corporate income tax rate   (1,390)  
Impairment of foreign tax credits   (834)  
Net impact of tax charges on deemed repatriation of accumulated earnings of non-US subsidiaries   (194)  
Recognition of Alternative Minimum Tax Credits   95  
Other impacts   3  
Taxation (income) charges related to exceptional items   $ (2,320)