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Financial instruments and risk management - Schedule of contractual cash flows (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Jun. 30, 2023
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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)

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