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Taxation - Net deferred tax assets and liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Income Taxes [Abstract]      
Deferred tax assets $ 143 $ 178 [1] $ 138 [1]
Deferred tax liabilities (2,947) (2,751) [1] (2,807) [1]
Net deferred tax liabilities $ (2,804) $ (2,573) $ (2,669)
[1] (1)  See pages 238-240 for an explanation under Accounting information and policies.