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Equity - Schedule of movements in own shares (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
Disclosure of classes of share capital [line items]      
Beginning balance [1] $ (11,709) [2] $ (11,511) [2] $ (11,719)
Ending balance $ (12,070) $ (11,709) [1],[2] $ (11,511) [1],[2]
Own shares      
Disclosure of classes of share capital [line items]      
Beginning balance (in shares) 216 219 223
Beginning balance [1] $ 2,286 $ 2,223 $ 2,609
Other(1) (in shares)   0 0
Retranslation impact of opening balances(1)   $ 93 $ (334)
Ending balance (in shares) 212 216 219
Ending balance $ 2,250 $ 2,286 [1] $ 2,223 [1]
Own shares | Share trust arrangements      
Disclosure of classes of share capital [line items]      
Increase (decrease) due to share based payment transactions (in shares) (2) (1) (2)
Increase (decrease) due to share based payment transactions $ (19) $ (15) $ (31)
Own shares | Shares used to satisfy options      
Disclosure of classes of share capital [line items]      
Increase (decrease) due to share based payment transactions (in shares) (2) (2) (2)
Increase (decrease) due to share based payment transactions $ (17) $ (15) $ (21)
Own shares | Share buyback programme      
Disclosure of classes of share capital [line items]      
Number of shares purchased - share buyback programme (in shares) 28 38 61
Shares purchased - share buyback programme $ 987 $ 1,673 $ 2,985
Shares cancelled (number) (28) (38) (61)
Shares cancelled $ (987) $ (1,673) $ (2,985)
[1] (1)  See pages 238-240 for an explanation under Accounting information and policies.
[2] (1)  See pages 238-240 for an explanation under Accounting information and policies.