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Post employment benefits - Timing of benefit payments and average duration of defined benefit obligations and distribution of timing of benefit payments (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 0 £ 0
United Kingdom    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 8,740 £ 8,972
Average duration of the defined benefit obligation 14 years 15 years
United Kingdom | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 303 £ 295
United Kingdom | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 1,090 1,082
United Kingdom | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,439 2,556
United Kingdom | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,244 2,252
United Kingdom | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,664 2,787
Ireland    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 2,559 £ 2,529
Average duration of the defined benefit obligation 14 years 15 years
Ireland | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 73 £ 70
Ireland | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 367 353
Ireland | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 727 704
Ireland | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 645 634
Ireland | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 747 768
United States    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 955 £ 912
Average duration of the defined benefit obligation 9 years 9 years
United States | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 57 £ 58
United States | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 174 187
United States | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 331 310
United States | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 206 183
United States | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 187 £ 174