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Net Debt - Summary of Maturity Profile of Financial Liabilities Based on the Contractual Amounts (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Disclosure of financial liabilities [line items]    
Bank loans, debentures and other loans, contractual amount $ 15,863 $ 21,631
Expected future interest payments, contractual amount 7,018 7,596
Derivatives related to debentures, contractual amount 1,169 2,134
Other derivatives, contractual amount 786 60
Obligations under lease liabilities, contractual amount 4,899 3,935
Total, contractual amount 36,586 40,979
Bank loans, debentures and other loans, carrying amount 17,087 23,605
Derivatives related to debentures, carrying amount 586 1,579
Other derivatives, carrying amount 690 60
Obligations under lease liabilities, carrying amount 3,896 3,443
Trade and other payables, carrying amount 6,851 5,623
Total financial liabilities 29,110 34,310
Due not later than one year [member]    
Disclosure of financial liabilities [line items]    
Bank loans, debentures and other loans, contractual amount 1,722 4,138
Expected future interest payments, contractual amount 729 813
Derivatives related to debentures, contractual amount 61 260
Other derivatives, contractual amount 149 60
Obligations under lease liabilities, contractual amount 980 927
Total, contractual amount 10,492 11,820
Trade and other payables, carrying amount 6,851 5,622
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 2,278 1,665
Expected future interest payments, contractual amount 661 702
Derivatives related to debentures, contractual amount 267 81
Other derivatives, contractual amount 80  
Obligations under lease liabilities, contractual amount 680 630
Total, contractual amount 3,966 3,079
Trade and other payables, carrying amount   1
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 4,062 5,727
Expected future interest payments, contractual amount 1,492 1,713
Derivatives related to debentures, contractual amount 256 819
Other derivatives, contractual amount 240  
Obligations under lease liabilities, contractual amount 1,397 1,335
Total, contractual amount 7,447 9,594
Due later than five years [member]    
Disclosure of financial liabilities [line items]    
Bank loans, debentures and other loans, contractual amount 7,801 10,101
Expected future interest payments, contractual amount 4,136 4,368
Derivatives related to debentures, contractual amount 585 974
Other derivatives, contractual amount 317  
Obligations under lease liabilities, contractual amount 1,842 1,043
Total, contractual amount $ 14,681 $ 16,486