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Interests in Joint Operations - Summary of Assets Held in Joint Operations (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of significant joint operations [line items]      
Current assets $ 23,373 $ 35,130  
Non-current assets 77,488 76,863 $ 95,950
Total assets 100,861 111,993 $ 117,006
Joint operations [member]      
Disclosure of significant joint operations [line items]      
Current assets 1,946 2,445  
Non-current assets 35,682 36,144  
Total assets $ 37,628 $ 38,589