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Cash and Cash Equivalents - Additional Information (Details) - GBP (£)
£ in Millions
Mar. 13, 2024
Dec. 31, 2024
Dec. 31, 2023
Cash And Cash Equivalent [Line Items]      
Cash and cash equivalents   £ 5,297 £ 4,659
Accrued interest   55 39
Restricted cash and cash equivalents principally due to exchange control restrictions   339 392
ITC Ltd.      
Cash And Cash Equivalent [Line Items]      
Proportion of ownership interest in associate disposed (in percentage) 12.00%    
Imperial Tobacco Canada      
Cash And Cash Equivalent [Line Items]      
Cash and cash equivalents   2,249 2,042
Restricted cash and cash equivalents   2,072 1,904
Hedging Instrument      
Cash And Cash Equivalent [Line Items]      
Cash and cash equivalents   £ 49 £ 38