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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, 2022 GBP (£) yr | Jun. 30, 2021 GBP (£) | Jun. 30, 2020 GBP (£)
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | £ 4,409 | £ 3,731 | £ 2,137
Profit for the year | £ 3,338 | £ 2,799 | £ 1,454
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 | 19 |  |
Plan liabilities | 336 |  |
United Kingdom | Effect of 0.5% decrease in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | (3) |  |
Profit for the year | (17) |  |
Plan liabilities | (374) |  |
United Kingdom | Effect of 0.5% increase in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | (2) |  |
Profit for the year | (9) |  |
Plan liabilities | (246) |  |
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 | 10 |  |
Plan liabilities | 260 |  |
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 | (171) |  |
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 | 4 |  |
Plan liabilities | 96 |  |
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 | (108) |  |
Ireland | Effect of 0.5% increase in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | (1) |  |
Profit for the year | (3) |  |
Plan liabilities | (59) |  |
Ireland | Effect of 0.5% decrease in inflation |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 1 |  |
Profit for the year | 3 |  |
Plan liabilities | 57 |  |
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 | (56) |  |
United States | Effect of 0.5% increase in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | 1 |  |
Profit for the year | 3 |  |
Plan liabilities | 22 |  |
United States | Effect of 0.5% decrease in discount rate |  |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |  |
Operating profit | (1) |  |
Profit for the year | (3) |  |
Plan liabilities | (23) |  |
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 | (10) |  |
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 | 9 |  |
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 | £ (17) |  |

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