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Intangible assets - Cost less accumulated amortisation and impairment (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Oct. 12, 2022
Breakdown of intangible assets and goodwill      
Balance at the beginning £ 7,303 [1] £ 2,164  
Balance at the end [1] 7,042 7,303  
Goodwill 5,016 5,100  
Measurement period adjustments      
Breakdown of intangible assets and goodwill      
Goodwill   (16) £ (16)
Cost      
Breakdown of intangible assets and goodwill      
Balance at the beginning 8,165 3,040  
Exchange differences (405) (177)  
Additions 44 37  
Disposals/retirements (37) (193)  
Acquisition of companies and businesses 252 5,441  
Hyperinflationary adjustment 18 18  
Disposal of companies and businesses   (1)  
Balance at the end 8,037 8,165  
Accumulated amortisation/depreciation and impairment      
Breakdown of intangible assets and goodwill      
Balance at the beginning (862) (876)  
Exchange differences 43 (37)  
Disposals/retirements 36 192  
Hyperinflationary adjustment (11) (1)  
Impairment charge (4) (22)  
Amortisation charge (197) (118)  
Balance at the end (995) (862)  
Goodwill      
Breakdown of intangible assets and goodwill      
Balance at the beginning 5,100 1,844  
Balance at the end 5,016 5,100  
Goodwill | Cost      
Breakdown of intangible assets and goodwill      
Balance at the beginning 5,165 1,888  
Exchange differences (269) (72)  
Disposals/retirements (2)    
Acquisition of companies and businesses 172 3,336  
Hyperinflationary adjustment 14 14  
Disposal of companies and businesses   (1)  
Balance at the end 5,080 5,165  
Goodwill | Accumulated amortisation/depreciation and impairment      
Breakdown of intangible assets and goodwill      
Balance at the beginning (65) (44)  
Exchange differences 12 1  
Disposals/retirements 2    
Hyperinflationary adjustment (10)    
Impairment charge (3) (22)  
Balance at the end (64) (65)  
Customer lists      
Breakdown of intangible assets and goodwill      
Balance at the beginning 900 241  
Balance at the end 771 900  
Customer lists | Cost      
Breakdown of intangible assets and goodwill      
Balance at the beginning 1,473 876  
Exchange differences (70) (5)  
Disposals/retirements (15) (180)  
Acquisition of companies and businesses 69 779  
Hyperinflationary adjustment 3 3  
Balance at the end 1,460 1,473  
Customer lists | Accumulated amortisation/depreciation and impairment      
Breakdown of intangible assets and goodwill      
Balance at the beginning (573) (635)  
Exchange differences 26 (31)  
Disposals/retirements 15 179  
Hyperinflationary adjustment (1) (1)  
Impairment charge (1)    
Amortisation charge (155) (85)  
Balance at the end (689) (573)  
Indefinite lived brands      
Breakdown of intangible assets and goodwill      
Balance at the beginning 1,185    
Balance at the end 1,127 1,185  
Indefinite lived brands | Cost      
Breakdown of intangible assets and goodwill      
Balance at the beginning 1,185    
Exchange differences (58) (107)  
Acquisition of companies and businesses   1,292  
Balance at the end 1,127 1,185  
Other intangibles      
Breakdown of intangible assets and goodwill      
Balance at the beginning 37 19  
Balance at the end 37 37  
Other intangibles | Cost      
Breakdown of intangible assets and goodwill      
Balance at the beginning 81 67  
Exchange differences (5) 2  
Disposals/retirements (12) (12)  
Acquisition of companies and businesses 11 23  
Hyperinflationary adjustment 1 1  
Balance at the end 76 81  
Other intangibles | Accumulated amortisation/depreciation and impairment      
Breakdown of intangible assets and goodwill      
Balance at the beginning (44) (48)  
Exchange differences 2 (2)  
Disposals/retirements 12 12  
Amortisation charge (9) (6)  
Balance at the end (39) (44)  
Product development      
Breakdown of intangible assets and goodwill      
Balance at the beginning 18 14  
Balance at the end 21 18  
Product development | Cost      
Breakdown of intangible assets and goodwill      
Balance at the beginning 55 46  
Exchange differences   (1)  
Additions 10 10  
Balance at the end 65 55  
Product development | Accumulated amortisation/depreciation and impairment      
Breakdown of intangible assets and goodwill      
Balance at the beginning (37) (32)  
Amortisation charge (7) (5)  
Balance at the end (44) (37)  
Computer software      
Breakdown of intangible assets and goodwill      
Balance at the beginning 63 46  
Balance at the end 70 63  
Computer software | Cost      
Breakdown of intangible assets and goodwill      
Balance at the beginning 206 163  
Exchange differences (3) 6  
Additions 34 27  
Disposals/retirements (8) (1)  
Acquisition of companies and businesses   11  
Balance at the end 229 206  
Computer software | Accumulated amortisation/depreciation and impairment      
Breakdown of intangible assets and goodwill      
Balance at the beginning (143) (117)  
Exchange differences 3 (5)  
Disposals/retirements 7 1  
Amortisation charge (26) (22)  
Balance at the end £ (159) £ (143)  
[1] Goodwill, right-of-use assets, investments in associated undertakings, contract costs, accrued income, accruals, loans, long-term liabilities, lease liabilities, deferred tax liabilities, and provisions have been retrospectively adjusted in 2022, in accordance with IFRS 3, to reflect measurement period adjustments made relating to the Terminix acquisition (see Note B1).