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Financial Risk Management - Summary of Financial Assets and Liabilities by Class (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets $ 1,199 $ 1,353  
Cash and cash equivalents 15,871 14,153 $ 10,319
Trade and other receivables 2,925 2,733  
Loans to equity accounted investments 13 644  
Total financial assets 20,008 18,883  
Non-financial assets 91,985 98,123  
Total assets 111,993 117,006 118,953
Other financial liabilities 1,231 1,500  
Trade and other payables 5,791 5,422  
Bank overdrafts and short-term borrowings 58 45 43
Bank loans 2,555 2,281  
Notes and debentures 23,298 27,041  
Finance leases 802 897  
Other 92 210  
Total financial liabilities 33,827 37,396  
Non-financial liabilities 17,496 16,884  
Total liabilities 51,323 54,280 $ 58,882
Current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 121 250  
Current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 17 144  
Non-current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 1,092 1,095  
Non-current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 1 11  
Current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 12    
Current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 170 41  
Current available for sale shares and other investments [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 18 31  
Non-current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 396 605  
Non-current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 195 332  
Non-current available for sale shares and other investments [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 408 344  
Loans and receivables [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Cash and cash equivalents 15,871 14,153  
Trade and other receivables 1,799 1,813  
Loans to equity accounted investments 13 644  
Total financial assets 17,683 16,610  
Available for sale securities [member] | Level 3 [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 80 70  
Total financial assets 80 70  
Available for sale securities [member] | Level 3 [member] | Non-current available for sale shares and other investments [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 80 70  
Held at fair value through profit or loss [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 1,146 1,256  
Trade and other receivables 1,126 920  
Total financial assets 2,272 2,176  
Other financial liabilities 487 186  
Trade and other payables 377 502  
Total financial liabilities 864 688  
Held at fair value through profit or loss [member] | Current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 171 (4)  
Held at fair value through profit or loss [member] | Current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 17 144  
Held at fair value through profit or loss [member] | Non-current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 298 42  
Held at fair value through profit or loss [member] | Non-current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 1 4  
Held at fair value through profit or loss [member] | Current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 12    
Held at fair value through profit or loss [member] | Current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 170 41  
Held at fair value through profit or loss [member] | Current available for sale shares and other investments [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 18 31  
Held at fair value through profit or loss [member] | Non-current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 423 578  
Held at fair value through profit or loss [member] | Non-current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 195 332  
Held at fair value through profit or loss [member] | Non-current available for sale shares and other investments [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets 328 274  
Cash flow hedges [member] | Level 2 [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets (27) 27  
Total financial assets (27) 27  
Other financial liabilities 744 1,314  
Total financial liabilities 744 1,314  
Cash flow hedges [member] | Level 2 [member] | Current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities (50) 254  
Cash flow hedges [member] | Level 2 [member] | Non-current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities 794 1,053  
Cash flow hedges [member] | Level 2 [member] | Non-current other derivative contracts [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial liabilities   7  
Cash flow hedges [member] | Level 2 [member] | Non-current cross currency and interest rate swaps [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Other financial assets (27) 27  
Other financial assets and liabilities at amortized cost [member]      
Disclosure of detailed information about financial instruments [Line Items]      
Trade and other payables 5,414 4,920  
Bank overdrafts and short-term borrowings 58 45  
Bank loans 2,555 2,281  
Notes and debentures 23,298 27,041  
Finance leases 802 897  
Other 92 210  
Total financial liabilities $ 32,219 $ 35,394