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Post employment benefits - Balance sheet analysis of post employment plans (Parenthetical) (Details) - GBP (£)
£ in Millions
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
DPS      
Disclosure of defined benefit plans [line items]      
Surplus in plan £ 1,174 £ 840 £ 934
GIGIPS      
Disclosure of defined benefit plans [line items]      
Surplus in plan 221 (79) (174)
Other Schemes      
Disclosure of defined benefit plans [line items]      
Surplus in plan £ 158 £ 178 £ 177