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Analysis of the net investment in business interests and intangible assets (Details) - GBP (£)
£ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Analysis of the net investment in business interests and intangible assets      
Fair value given for businesses acquired     £ (55)
Additional investment in associates £ (51) £ (40)  
Net assets/liabilities purchased (3,128)    
Net outflow of cash in respect of acquisitions 3,179 40 55
Sale of interests in associates   27  
Net assets/liabilities disposed 114 288 351
Profit on disposal 55 3  
Net inflow of cash in respect of disposals 169 318 351
Cash expenditure on intangible assets (479) (348) (380)
Net outflow of cash £ (3,489) £ (70) £ (84)