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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, 2022
Jun. 30, 2021
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 £ 8,972 £ 9,160
Average duration of the defined benefit obligation 15 years 18 years
United Kingdom | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 295 £ 288
United Kingdom | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 1,082 1,112
United Kingdom | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,556 2,606
United Kingdom | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,252 2,314
United Kingdom | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 2,787 2,840
Ireland    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 2,529 £ 2,412
Average duration of the defined benefit obligation 15 years 18 years
Ireland | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 70 £ 84
Ireland | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 353 338
Ireland | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 704 656
Ireland | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 634 588
Ireland | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 768 746
United States    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 912 £ 727
Average duration of the defined benefit obligation 9 years 11 years
United States | Within one year    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 58 £ 52
United States | Between 1 to 5 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 187 145
United States | Between 6 to 15 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 310 247
United States | Between 16 to 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid 183 145
United States | Beyond 25 years    
Disclosure of defined benefit plans [line items]    
Benefits expected to be paid £ 174 £ 138