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Post employment benefits - Sensitivity analyses of potential impacts on consolidated income statement and on plan liabilities (Details) £ in Millions | 12 Months Ended
--- | ---
Jun. 30, 2023 GBP (£) yr | Jun. 30, 2022 GBP (£) | Jun. 30, 2021 GBP (£)
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | £ 4,632 | £ 4,409 | £ 3,731
Profit for the year | £ 3,766 | £ 3,338 | £ 2,799
Discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |  |
Inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Percentage of reasonably possible increase in actuarial assumption | 0.50% |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.50% |  |
Life expectancy |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Duration of reasonably possible increase in actuarial assumption | yr | 1 |  |
United Kingdom | Effect of 0.5% increase in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | £ 2 |  |
Profit for the year | 15 |  |
Plan liabilities | 259 |  |
United Kingdom | Effect of 0.5% decrease in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | (2) |  |
Profit for the year | (14) |  |
Plan liabilities | (267) |  |
United Kingdom | Effect of 0.5% increase in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | (1) |  |
Profit for the year | (8) |  |
Plan liabilities | (156) |  |
United Kingdom | Effect of 0.5% decrease in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 2 |  |
Profit for the year | 8 |  |
Plan liabilities | 173 |  |
United Kingdom | Effect of one year increase in life expectancy |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 0 |  |
Profit for the year | (6) |  |
Plan liabilities | (131) |  |
Ireland | Effect of 0.5% increase in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 1 |  |
Profit for the year | 5 |  |
Plan liabilities | 85 |  |
Ireland | Effect of 0.5% decrease in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | (1) |  |
Profit for the year | (4) |  |
Plan liabilities | (95) |  |
Ireland | Effect of 0.5% increase in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 0 |  |
Profit for the year | (2) |  |
Plan liabilities | (49) |  |
Ireland | Effect of 0.5% decrease in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 0 |  |
Profit for the year | 2 |  |
Plan liabilities | 50 |  |
Ireland | Effect of one year increase in life expectancy |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 0 |  |
Profit for the year | (2) |  |
Plan liabilities | (55) |  |
United States | Effect of 0.5% increase in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 2 |  |
Profit for the year | 2 |  |
Plan liabilities | 22 |  |
United States | Effect of 0.5% decrease in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | (2) |  |
Profit for the year | (2) |  |
Plan liabilities | (24) |  |
United States | Effect of 0.5% increase in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 0 |  |
Profit for the year | (1) |  |
Plan liabilities | (9) |  |
United States | Effect of 0.5% decrease in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 0 |  |
Profit for the year | 1 |  |
Plan liabilities | 8 |  |
United States | Effect of one year increase in life expectancy |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 0 |  |
Profit for the year | (1) |  |
Plan liabilities | £ (15) |  |

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