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Leases - Summary of Movement in Right of use Assets and Lease Liabilities (Details) - GBP (£)
£ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Leases [Line Items]      
Beginning balance, right-of-use assets £ 1,382 £ 1,528  
Additions 358 305  
Transfers to net investment in subleases   (5)  
Disposals (103) (10)  
Depreciation of right-of-use assets (213) (257) £ (262)
Impairment charges included within restructuring costs (1) (129) (34)
Exchange adjustments (38) (50)  
Ending balance, right-of-use assets 1,385 1,382 1,528
Lease liabilities, beginning balance 2,154 2,210  
Additions 307 288  
Interest expense related to lease liabilities 98 106 96
Disposals (126) (13)  
Repayment of lease liabilities (including interest) (377) (362)  
Exchange adjustments (36) (75)  
Lease liabilities, ending balance 2,020 2,154 2,210
Land and buildings      
Disclosure Of Leases [Line Items]      
Beginning balance, right-of-use assets 1,309 1,482  
Additions 334 255  
Transfers to net investment in subleases   (5)  
Disposals (82) (9)  
Depreciation of right-of-use assets (197) (236) (245)
Impairment charges included within restructuring costs (1) (129)  
Exchange adjustments (35) (49)  
Ending balance, right-of-use assets 1,328 1,309 1,482
Lease liabilities, beginning balance 2,078 2,162  
Additions 291 238  
Interest expense related to lease liabilities 95 103  
Disposals (105) (11)  
Repayment of lease liabilities (including interest) (359) (340)  
Exchange adjustments (33) (74)  
Lease liabilities, ending balance 1,967 2,078 2,162
Plant and machinery      
Disclosure Of Leases [Line Items]      
Beginning balance, right-of-use assets 73 46  
Additions 24 50  
Transfers to net investment in subleases   0  
Disposals (21) (1)  
Depreciation of right-of-use assets (16) (21) (17)
Impairment charges included within restructuring costs 0 0  
Exchange adjustments (3) (1)  
Ending balance, right-of-use assets 57 73 46
Lease liabilities, beginning balance 76 48  
Additions 16 50  
Interest expense related to lease liabilities 3 3  
Disposals (21) (2)  
Repayment of lease liabilities (including interest) (18) (22)  
Exchange adjustments (3) (1)  
Lease liabilities, ending balance £ 53 £ 76 £ 48