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Leases - Summary of Maturity Profile of Lease Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2020
Jun. 30, 2019
Disclosure of Maturity Analysis of Lease Liabilities [Line Items]    
Obligations under lease liabilities, contractual amount $ 3,935 $ 1,028
Total 3,443 715
In one year or less or on demand    
Disclosure of Maturity Analysis of Lease Liabilities [Line Items]    
Obligations under lease liabilities, contractual amount 927 110
In more than one year but not more than two years    
Disclosure of Maturity Analysis of Lease Liabilities [Line Items]    
Obligations under lease liabilities, contractual amount 630 110
In more than two years but not more than five years    
Disclosure of Maturity Analysis of Lease Liabilities [Line Items]    
Obligations under lease liabilities, contractual amount 1,335 307
In more than five years    
Disclosure of Maturity Analysis of Lease Liabilities [Line Items]    
Obligations under lease liabilities, contractual amount $ 1,043 $ 501