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Net borrowings - Net borrowings by currency (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2022
 [1],[2]
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents $ 1,130 $ 1,813 [1],[2] $ 2,765
Gross borrowings (22,147) (21,395)  
US dollar      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 130 682  
Gross borrowings (9,590) (7,247)  
Euro      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 59 60  
Gross borrowings (5,820) (4,870)  
Cash and cash equivalents in cash-pooling arrangements 11 26  
Sterling      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 29 59  
Gross borrowings (4,767) (7,846)  
Indian rupee      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 170 155  
Gross borrowings (57) (39)  
Mexican peso      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 34 31  
Gross borrowings (261) (361)  
Hungarian forint      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 3 4  
Gross borrowings (21) (329)  
Kenyan shilling      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 55 36  
Gross borrowings (295) (318)  
Chinese yuan      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 258 251  
Gross borrowings (964) (79)  
Nigerian naira      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 0 105  
Gross borrowings 0 0  
Other      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Cash and cash equivalents 392 430  
Gross borrowings $ (372) $ (306)  
[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.