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Equity - Monte Carlo pricing model assumptions used for the calculation of the fair value of share awards (Details)
£ / shares in Units, £ in Millions, shares in Millions
 12 Months Ended
Jun. 30, 2021
GBP (£)
shares
£ / shares
Jun. 30, 2020
GBP (£)
shares
£ / shares
Jun. 30, 2019
GBP (£)
shares
£ / shares
Disclosure of reserves within equity [abstract]      
Risk free interest rate (0.10%) 0.40% 0.80%
Expected life of the awards 36 months 37 months 37 months
Dividend yield 2.70% 1.90% 2.40%
Weighted average share price (in GBP per share) £ 25.57 £ 35.01 £ 27.36
Weighted average fair value of awards granted in the year £ 21.07 £ 8.99 £ 19.41
Number of awards granted in the year (in shares) | shares 2.1 1.7 2.5
Fair value of all awards granted in the year | £ £ 45 £ 16 £ 48