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Net Debt - Summary of Interest Bearing Liabilities and Cash and Cash Equivalents Denominated by Currency (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
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Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Interest bearing liabilities | $ 26,805 | $ 30,474 |
Cash and cash equivalents | 15,871 | 14,153 | $ 10,319
USD [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Interest bearing liabilities | 12,981 | 14,035 |
Cash and cash equivalents | 7,024 | 7,980 |
EUR [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Interest bearing liabilities | 9,070 | 10,324 |
Cash and cash equivalents | 5,845 | 4,663 |
GBP [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Interest bearing liabilities | 3,104 | 3,520 |
Cash and cash equivalents | 1,560 | 1,318 |
AUD [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Interest bearing liabilities | 1,077 | 1,987 |
Cash and cash equivalents | 9 | 9 |
CAD [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Interest bearing liabilities | 573 | 608 |
Cash and cash equivalents | 1,301 | 77 |
Other [Member] |  |  |
Disclosure of nature and extent of risks arising from financial instruments [Line Items] |  |  |
Cash and cash equivalents | $ 132 | $ 106 |

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