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Interests in Joint Operations - Summary of Assets Held in Joint Operations (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of significant joint operations [Line Items]      
Current assets $ 35,130 $ 21,056  
Non-current assets 76,863 95,950 $ 101,239
Total assets 111,993 117,006 $ 118,953
Joint operations [member]      
Disclosure of significant joint operations [Line Items]      
Current assets 2,445 2,755  
Non-current assets 36,144 51,446  
Total assets $ 38,589 $ 54,201