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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
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