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Net Debt - Summary of Maturity Profile of Financial Liabilities Based on the Contractual Amounts (Detail) - USD ($) $ in Millions | Jun. 30, 2018 | Jun. 30, 2017
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Disclosure of financial liabilities [Line Items] |  |
Bank loans, debentures and other loans, contractual amount | $ 25,498 | $ 28,613
Expected future interest payments, contractual amount | 9,361 | 10,567
Derivatives related to net debt, contractual amount | 2,504 | 2,990
Other derivatives, contractual amount | 18 | 155
Obligations under finance leases, contractual amount | 1,165 | 1,315
Trade and other payables, contractual amount | 5,791 | 5,422
Total, contractual amount | 44,337 | 49,062
Bank loans, debentures and other loans, carrying amount | 26,003 | 29,577
Derivatives related to net debt, carrying amount | 1,213 | 1,345
Other derivatives, carrying amount | 18 | 155
Obligations under finance leases, carrying amount | 802 | 897
Trade and other payables, carrying amount | 5,791 | 5,422
Total financial liabilities | 33,827 | 37,396
Due not later than one year [Member] |  |
Disclosure of financial liabilities [Line Items] |  |
Bank loans, debentures and other loans, contractual amount | 2,647 | 1,157
Expected future interest payments, contractual amount | 682 | 686
Derivatives related to net debt, contractual amount | 302 | 267
Other derivatives, contractual amount | 17 | 144
Obligations under finance leases, contractual amount | 127 | 135
Trade and other payables, contractual amount | 5,788 | 5,417
Total, contractual amount | 9,563 | 7,806
In more than one year but not more than two years [Member] |  |
Disclosure of financial liabilities [Line Items] |  |
Bank loans, debentures and other loans, contractual amount | 1,545 | 2,471
Expected future interest payments, contractual amount | 957 | 1,022
Derivatives related to net debt, contractual amount | 188 | 245
Other derivatives, contractual amount | 1 | 4
Obligations under finance leases, contractual amount | 113 | 132
Trade and other payables, contractual amount | 3 | 5
Total, contractual amount | 2,807 | 3,879
In more than two years but not more than five years [Member] |  |
Disclosure of financial liabilities [Line Items] |  |
Bank loans, debentures and other loans, contractual amount | 8,019 | 8,279
Expected future interest payments, contractual amount | 2,203 | 2,611
Derivatives related to net debt, contractual amount | 823 | 503
Other derivatives, contractual amount |  | 7
Obligations under finance leases, contractual amount | 335 | 343
Total, contractual amount | 11,380 | 11,743
Due later than five years [member] |  |
Disclosure of financial liabilities [Line Items] |  |
Bank loans, debentures and other loans, contractual amount | 13,287 | 16,706
Expected future interest payments, contractual amount | 5,519 | 6,248
Derivatives related to net debt, contractual amount | 1,191 | 1,975
Obligations under finance leases, contractual amount | 590 | 705
Total, contractual amount | $ 20,587 | $ 25,634

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