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Financial Risk Management - Summary of Financial Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Jun. 30, 2018
Disclosure of detailed information about financial instruments [line items]    
Other financial assets $ 1,122 $ 1,199
Cash and cash equivalents 15,575 15,871
Total financial assets 22,893 20,008
Non-financial assets 79,521 91,985
Total assets 102,414 111,993
Other financial liabilities 1,275 1,231
Total financial liabilities 32,237 33,827
Non-financial liabilities 14,861 17,496
Total liabilities 47,098 51,323
Financial assets held at amortised cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Cash and cash equivalents 15,575 15,871
Loans to equity accounted investments 13 13
Financial liabilities held at amortised cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Bank overdrafts and short-term borrowings 476 58
Bank loans 2,502 2,555
Notes and debentures 21,714 23,298
Finance leases 749 802
Other 24 92
Trades and other payables [member] | Financial liabilities held at amortised cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade and other payables 5,094 5,414
Provisionally priced trade payables [member] | Financial liabilities held at fair value through profit or loss [member] | Level 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade and other payables 403 377
Current cross currency and interest rate swaps [member] | Financial liabilities held at fair value through profit or loss [member] | Level 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial liabilities   121
Current other derivative contracts [member] | Financial liabilities held at fair value through profit or loss [member] | Levels 2 and 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial liabilities 19 17
Non-current cross currency and interest rate swaps [member] | Financial liabilities held at fair value through profit or loss [member] | Level 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial liabilities 1,255 1,092
Non-current other derivative contracts [member] | Financial liabilities held at fair value through profit or loss [member] | Levels 2 and 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial liabilities 1 1
Trade And Other Receivable [member] | Financial assets held at amortised cost [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade and other receivables 5,117 1,799
Provisionally priced trade receivables [member] | Financial assets held at fair value through profit or loss [member] | Level 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Trade and other receivables 1,066 1,126
Current cross currency and interest rate swaps [member] | Financial assets held at fair value through profit or loss [member] | Level 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 1 12
Current other derivative contracts [member] | Financial assets held at fair value through profit or loss [member] | Levels 2 and 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 219 170
Current other investments [member] | Financial assets held at fair value through profit or loss [member] | Level 1 and 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 17 18
Non-current cross currency and interest rate swaps [member] | Financial assets held at fair value through profit or loss [member] | Level 2 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 335 396
Non-current other derivative contracts [member] | Financial assets held at fair value through profit or loss [member] | Levels 2 and 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 186 195
Non-current investment in shares [member] | Financial assets held at fair value through other comprehensive income [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 33 33
Non-current other investments [member] | Financial assets held at fair value through profit or loss [member] | Level 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets 47 47
Non-current other investments [member] | Financial assets held at fair value through profit or loss [member] | Levels 1, 2 and 3 [member]    
Disclosure of detailed information about financial instruments [line items]    
Other financial assets $ 331 $ 375