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Reconciliation of movement in net borrowings - Narrative (Details)
€ in Millions, £ in Millions, $ in Millions
 6 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Dec. 31, 2021
EUR (€)
Dec. 31, 2022
GBP (£)
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Bonds issued $ 2,000       £ 1,788
Repayment of bonds $ 300 £ 254 £ 769 € 900  
Proportion of ownership interest in subsidiary 100.00% 100.00%      
Five Point Two Percentage Bonds Due Two Thousand Twenty Five          
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Notional amount bonds $ 500        
Borrowings, interest rate 5.20%       5.20%
Five Point Three Percentage Bonds Due Two Thousand Twenty Seven          
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Notional amount bonds $ 750        
Borrowings, interest rate 5.30%       5.30%
Five Point Five Percentage Bonds Due Two Thousand Thirty Three          
Disclosure of reconciliation of liabilities arising from financing activities [line items]          
Notional amount bonds $ 750        
Borrowings, interest rate 5.50%       5.50%