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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
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