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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, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of exceptional items [line items]      
Taxation (income) charges related to exceptional items $ 241 $ 242 $ (2,320)
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)