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Intangible assets - Cost less accumulated amortisation and impairment (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Breakdown of intangible assets and goodwill    
Balance at the beginning £ 2,164 £ 1,922
Balance at the end 7,319 2,164
Cost    
Breakdown of intangible assets and goodwill    
Balance at the beginning 3,040 2,728
Exchange differences (177) (11)
Additions 37 31
Disposals/retirements (193) (8)
Acquisition of companies and businesses 5,457 297
Hyperinflationary adjustment 18 3
Disposal of companies and businesses (1)  
Balance at the end 8,181 3,040
Acquisitions in the year 5,449 301
Accumulated amortisation/depreciation and impairment    
Breakdown of intangible assets and goodwill    
Balance at the beginning (876) (806)
Exchange differences (37) 12
Disposals/retirements 192 9
Hyperinflationary adjustment (1)  
Impairment charge (22) (2)
Amortisation charge (118) (89)
Balance at the end (862) (876)
Goodwill    
Breakdown of intangible assets and goodwill    
Balance at the beginning 1,844 1,608
Balance at the end 5,116 1,844
Goodwill | Cost    
Breakdown of intangible assets and goodwill    
Balance at the beginning 1,888 1,653
Exchange differences (72) 4
Acquisition of companies and businesses 3,352 228
Hyperinflationary adjustment 14 3
Disposal of companies and businesses (1)  
Balance at the end 5,181 1,888
Goodwill | Accumulated amortisation/depreciation and impairment    
Breakdown of intangible assets and goodwill    
Balance at the beginning (44) (45)
Exchange differences 1 1
Impairment charge (22)  
Balance at the end (65) (44)
Customer lists    
Breakdown of intangible assets and goodwill    
Balance at the beginning 241 239
Balance at the end 900 241
Customer lists | Cost    
Breakdown of intangible assets and goodwill    
Balance at the beginning 876 824
Exchange differences (5) (13)
Disposals/retirements (180) (4)
Acquisition of companies and businesses 779 69
Hyperinflationary adjustment 3  
Balance at the end 1,473 876
Customer lists | Accumulated amortisation/depreciation and impairment    
Breakdown of intangible assets and goodwill    
Balance at the beginning (635) (585)
Exchange differences (31) 10
Disposals/retirements 179 4
Hyperinflationary adjustment (1)  
Amortisation charge (85) (64)
Balance at the end (573) (635)
Indefinite lived brands    
Breakdown of intangible assets and goodwill    
Balance at the end 1,185  
Indefinite lived brands | Cost    
Breakdown of intangible assets and goodwill    
Exchange differences (107)  
Acquisition of companies and businesses 1,292  
Balance at the end 1,185  
Other intangibles    
Breakdown of intangible assets and goodwill    
Balance at the beginning 19 19
Balance at the end 37 19
Other intangibles | Cost    
Breakdown of intangible assets and goodwill    
Balance at the beginning 67 66
Exchange differences 2  
Additions   4
Disposals/retirements (12) (3)
Acquisition of companies and businesses 23  
Hyperinflationary adjustment 1  
Balance at the end 81 67
Other intangibles | Accumulated amortisation/depreciation and impairment    
Breakdown of intangible assets and goodwill    
Balance at the beginning (48) (47)
Exchange differences (2)  
Disposals/retirements 12 4
Amortisation charge (6) (5)
Balance at the end (44) (48)
Product development    
Breakdown of intangible assets and goodwill    
Balance at the beginning 14 13
Balance at the end 18 14
Product development | Cost    
Breakdown of intangible assets and goodwill    
Balance at the beginning 46 40
Exchange differences (1)  
Additions 10 6
Balance at the end 55 46
Product development | Accumulated amortisation/depreciation and impairment    
Breakdown of intangible assets and goodwill    
Balance at the beginning (32) (27)
Amortisation charge (5) (5)
Balance at the end (37) (32)
Computer software    
Breakdown of intangible assets and goodwill    
Balance at the beginning 46 43
Balance at the end 63 46
Computer software | Cost    
Breakdown of intangible assets and goodwill    
Balance at the beginning 163 145
Exchange differences 6 (2)
Additions 27 21
Disposals/retirements (1) (1)
Acquisition of companies and businesses 11  
Balance at the end 206 163
Computer software | Accumulated amortisation/depreciation and impairment    
Breakdown of intangible assets and goodwill    
Balance at the beginning (117) (102)
Exchange differences (5) 1
Disposals/retirements 1 1
Impairment charge   (2)
Amortisation charge (22) (15)
Balance at the end £ (143) £ (117)