v3.26.1
Income Taxes - Reconciliation of Income Tax Rate (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
Amount      
Tax expense at UK statutory tax rate $ 320 $ 163 $ 226
Other, net   (22) (6)
Change in valuation allowance   (18) 3
Foreign tax rate differential   (3) (3)
Changes in unrecognized tax benefits, net (32) (18) (51)
Non-deductible expenses, non-taxable items, net   33 (6)
Income tax expense $ 181 135 $ 163
Uncertain tax positions, net   15  
Effective income tax rate reconciliation, deferred tax increase (decrease), amount   $ 9  
Percentage      
Tax expense at UK statutory tax rate 25.00%    
Changes in unrecognized tax benefits, net (2.50%)    
Income tax expense 14.10% 20.80% 18.00%
United States of America      
Amount      
Effect of cross-border tax laws, net $ (34)    
Tax credits (23)    
Other reconciling items (45)    
Other, net $ (11)    
Percentage      
Effect of cross-border tax laws, net (2.70%)    
Tax credits (1.80%)    
Other reconciling items (3.50%)    
Other, net (0.80%)    
Australia:      
Amount      
Other, net $ 7    
Change in valuation allowance $ (31)    
Percentage      
Other, net 0.60%    
Changes in valuation allowance (2.40%)    
Other adjustments, net      
Amount      
Other, net $ 7    
Percentage      
Other, net 0.40%    
HMRC      
Percentage      
Tax expense at UK statutory tax rate 25.00% 25.00%  
ARGENTINA      
Amount      
Effective income tax rate reconciliation, inflation increase (decrease), amount     $ 14
Switzerland      
Amount      
Effective income tax rate reconciliation, tax reform increase (decrease), amount     $ 15
Rest of the world      
Amount      
Foreign tax rate differential $ 23    
Percentage      
Other foreign jurisdictions, net 1.80%