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Interests in Joint Operations - Summary of Assets Held in Joint Operations (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Disclosure of significant joint operations [line items]      
Current assets $ 26,693 $ 21,471  
Non-current assets 82,234 84,262  
Total assets 108,927 105,733 $ 101,811
Joint operations [member]      
Disclosure of significant joint operations [line items]      
Current assets 2,260 2,059  
Non-current assets 38,725 37,193  
Total assets $ 40,985 $ 39,252