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Net Debt - Summary of Maturity Profile of Financial Liabilities Based on the Contractual Amounts (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Jun. 30, 2018
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Disclosure of financial liabilities [line items] |  |
Bank loans, debentures and other loans, contractual amount | $ 22,869 | $ 25,498
Expected future interest payments, contractual amount | 8,399 | 9,361
Derivatives related to debentures, contractual amount | 2,086 | 2,504
Other derivatives, contractual amount | 65 | 18
Obligations under finance leases, contractual amount | 1,028 | 1,165
Trade and other payables, contractual amount | 6,560 | 5,791
Total, contractual amount | 41,007 | 44,337
Bank loans, debentures and other loans, carrying amount | 24,113 | 26,003
Derivatives related to debentures, carrying amount | 958 | 1,213
Other derivatives, carrying amount | 65 | 18
Obligations under finance leases, carrying amount | 715 | 802
Trade and other payables, carrying amount | 6,560 | 5,791
Total financial liabilities | 32,411 | 33,827
Due not later than one year [member] |  |
Disclosure of financial liabilities [line items] |  |
Bank loans, debentures and other loans, contractual amount | 1,587 | 2,647
Expected future interest payments, contractual amount | 864 | 682
Derivatives related to debentures, contractual amount | 200 | 302
Other derivatives, contractual amount | 64 | 17
Obligations under finance leases, contractual amount | 110 | 127
Trade and other payables, contractual amount | 6,555 | 5,788
Total, contractual amount | 9,380 | 9,563
Later than one year and not later than two years [member] |  |
Disclosure of financial liabilities [line items] |  |
Bank loans, debentures and other loans, contractual amount | 4,107 | 1,545
Expected future interest payments, contractual amount | 775 | 957
Derivatives related to debentures, contractual amount | 226 | 188
Other derivatives, contractual amount | 1 | 1
Obligations under finance leases, contractual amount | 110 | 113
Trade and other payables, contractual amount | 5 | 3
Total, contractual amount | 5,224 | 2,807
Later than two years and not later than five years [member] |  |
Disclosure of financial liabilities [line items] |  |
Bank loans, debentures and other loans, contractual amount | 5,513 | 8,019
Expected future interest payments, contractual amount | 1,864 | 2,203
Derivatives related to debentures, contractual amount | 558 | 823
Obligations under finance leases, contractual amount | 307 | 335
Total, contractual amount | 8,242 | 11,380
Due later than five years [member] |  |
Disclosure of financial liabilities [line items] |  |
Bank loans, debentures and other loans, contractual amount | 11,662 | 13,287
Expected future interest payments, contractual amount | 4,896 | 5,519
Derivatives related to debentures, contractual amount | 1,102 | 1,191
Obligations under finance leases, contractual amount | 501 | 590
Total, contractual amount | $ 18,161 | $ 20,587

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