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Financial instruments and risk management - Schedule of contractual cash flows (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Jun. 30, 2023
Disclosure about contractual cash flows [line items]    
Borrowings $ (21,501) $ (20,791)
Interest on borrowings (291) (274)
Lease capital repayments (604) (564)
Lease future interest payments 0 0
Trade and other financial liabilities (5,619) (6,025)
Non-derivative financial liabilities (28,015) (27,654)
Other derivative instruments (net)
Derivative instruments (23) 168
Within one year    
Disclosure about contractual cash flows [line items]    
Borrowings (2,885) (2,142)
Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Borrowings (4,873) (4,437)
Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Borrowings (4,222) (3,620)
Due after five years    
Disclosure about contractual cash flows [line items]    
Borrowings (9,521) (10,592)
Cross currency swaps (gross)    
Disclosure about contractual cash flows [line items]    
Receivable
Payable
Undiscounted amount    
Disclosure about contractual cash flows [line items]    
Borrowings (21,964) (21,362)
Interest on borrowings (4,489) (4,304)
Lease capital repayments (604) (564)
Lease future interest payments (115) (131)
Trade and other financial liabilities (5,818) (6,131)
Non-derivative financial liabilities (32,990) (32,492)
Other derivative instruments (net) (287) (254)
Derivative instruments (14) 362
Undiscounted amount | Within one year    
Disclosure about contractual cash flows [line items]    
Borrowings (2,902) (2,152)
Interest on borrowings (791) (681)
Lease capital repayments (95) (94)
Lease future interest payments (19) (23)
Trade and other financial liabilities (5,316) (5,565)
Non-derivative financial liabilities (9,123) (8,515)
Other derivative instruments (net) (39) 24
Derivative instruments (37) 44
Undiscounted amount | Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Borrowings (4,991) (4,553)
Interest on borrowings (1,043) (945)
Lease capital repayments (148) (131)
Lease future interest payments (30) (35)
Trade and other financial liabilities (280) (291)
Non-derivative financial liabilities (6,492) (5,955)
Other derivative instruments (net) (139) (111)
Derivative instruments (139) (72)
Undiscounted amount | Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Borrowings (4,259) (3,754)
Interest on borrowings (789) (784)
Lease capital repayments (95) (86)
Lease future interest payments (22) (25)
Trade and other financial liabilities (217) (154)
Non-derivative financial liabilities (5,382) (4,803)
Other derivative instruments (net) (76) (99)
Derivative instruments (130) (60)
Undiscounted amount | Due after five years    
Disclosure about contractual cash flows [line items]    
Borrowings (9,812) (10,903)
Interest on borrowings (1,866) (1,894)
Lease capital repayments (266) (253)
Lease future interest payments (44) (48)
Trade and other financial liabilities (5) (121)
Non-derivative financial liabilities (11,993) (13,219)
Other derivative instruments (net) (33) (68)
Derivative instruments 292 450
Undiscounted amount | Cross currency swaps (gross)    
Disclosure about contractual cash flows [line items]    
Receivable 5,592 1,963
Payable (5,319) (1,347)
Undiscounted amount | Cross currency swaps (gross) | Within one year    
Disclosure about contractual cash flows [line items]    
Receivable 128 55
Payable (126) (35)
Undiscounted amount | Cross currency swaps (gross) | Due between 1 and 3 years    
Disclosure about contractual cash flows [line items]    
Receivable 549 109
Payable (549) (70)
Undiscounted amount | Cross currency swaps (gross) | Due between 3 and 5 years    
Disclosure about contractual cash flows [line items]    
Receivable 1,249 109
Payable (1,303) (70)
Undiscounted amount | Cross currency swaps (gross) | Due after five years    
Disclosure about contractual cash flows [line items]    
Receivable 3,666 1,690
Payable $ (3,341) $ (1,172)