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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

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