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Post employment benefits - Amounts charged to consolidated income statement for group's defined benefit post employment plans and consolidated statement of comprehensive income (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2023
Disclosure of net defined benefit liability (asset) [line items]      
Current service cost and administrative expenses $ (88) $ (82) $ (91)
Past service gains/(losses) – ordinary activities 2 3 (1)
Gains on curtailments and settlements 0 0 2
Charge to operating profit (86) (79) (90)
Net finance income in respect of post-employment plans 35 37 53
Charge before taxation (51) (42) (37)
Actual returns less amounts included in finance income (460) (168) (1,722)
Experience (losses)/gains (139) 24 (273)
Changes in financial assumptions 495 20 1,150
Changes in demographic assumptions 92 43 65
Other comprehensive loss (12) (81) (780)
Changes in the surplus restriction (1) 5 9
Total other comprehensive loss $ (13) $ (76) $ (771)