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Taxation - Narrative (Details) - GBP (£)
£ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Income Taxes [Abstract]      
Current tax asset £ 145 £ 190  
Current tax liability 146 246  
Provision for tax uncertainties 129 189  
Income taxes paid, classified as operating activities 852 901 £ 805
Difference between current tax charge and cash tax paid 39 223  
Deferred tax assets 100 119  
Deferred tax assets arising in jurisdictions with prior year taxable losses 48 84  
Unrecognised temporary differences in respect of investments in subsidiaries, branches, interests in associates and joint ventures £ 16,400 £ 14,700