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Investments Accounted for Using the Equity Method - Summary of Financial Information of Significant Equity Accounted Investments (Parenthetical) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of significant investments in associates and joint ventures [Line Items]      
Cash and cash equivalents $ 15,871 $ 14,153 $ 10,319
Investment 2,473 2,448 2,575
Net finance costs (1,245) (1,417) (1,013)
Depreciation and amortisation 6,288 6,184 6,210
Interest income 322 143 137
Interest expense 1,567 1,560 1,150
Income tax (expense)/benefit (7,007) (4,443) (2,103)
Samarco dam failure [member]      
Disclosure of significant investments in associates and joint ventures [Line Items]      
Share of loss (80) (134) (655)
Impairment     (525)
Other movements (429) (38) (1,200)
Provision expense     (628)
Net finance costs (84) (127)  
Samarco Mineracao S.A. [member]      
Disclosure of significant investments in associates and joint ventures [Line Items]      
Cash and cash equivalents 23 29  
Current financial liabilities (excluding trade and other payables and provisions) 5,066 4,581  
Non-current financial liabilities (excluding trade and other payables and provisions) 1  
Investment    
Share of loss     (655)
Impairment     (525)
Other movements     (1,200)
Additional share of loss (2,092)   (572)
Provision expense     (628)
Loss from funding provided to Samarco (214)    
Net finance costs (211)    
Depreciation and amortisation 73 88 148
Interest income 31 57 43
Interest expense 385 473 209
Income tax (expense)/benefit (154) (851) 564
Share of operating profit/(loss) of equity accounted investments     (1,091)
Samarco Mineracao S.A. [member] | Samarco dam failure [member]      
Disclosure of significant investments in associates and joint ventures [Line Items]      
Obligations under the Framework Agreement (1,100) (1,500)  
Share of operating profit/(loss) of equity accounted investments     (1,227)
Samarco Mineracao S.A. [member] | Before Samarco dam failure [member]      
Disclosure of significant investments in associates and joint ventures [Line Items]      
Share of operating profit/(loss) of equity accounted investments     $ 136
Samarco Mineracao S.A. [member] | Framework agreement [member]      
Disclosure of significant investments in associates and joint ventures [Line Items]      
Obligations under the Framework Agreement (1,878)    
Individually immaterial, associates [member]      
Disclosure of significant investments in associates and joint ventures [Line Items]      
Unrecognised share of profits (losses) (56) 21  
Cumulative losses 196 140  
Investment $ 277 $ 324