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Risks Arising from Financial Instruments - Summary of Nominal Contractual Maturities of Non-Derivative Financial Liabilities (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Non-derivative financial liabilities    
Bank overdraft $ (29) $ (14)
Less than 1 year [member]    
Non-derivative financial liabilities    
Unsecured bond issues (5,218) (2,962)
Trade and other payables (24,662) (25,410)
lease liabilities (714) (704)
Secured bank loans (5) (5)
Commercial papers (200)  
Unsecured bank loans (222) (178)
Unsecured other loans (47) (84)
Bank overdraft (29) (14)
Non-derivative financial liabilities (31,098) (29,358)
Derivative financial assets/(liabilities)    
Equity derivatives (3,206) (5,481)
Foreign exchange derivatives (538) (416)
Cross currency interest rate swaps (70) (60)
Interest rate swaps (114) (102)
Commodity derivatives (107) (46)
Derivative financial assets/(liabilities) (4,034) (6,105)
Of which: related to cash flow hedges (473) (425)
1-2 years [member]    
Non-derivative financial liabilities    
Unsecured bond issues (9,052) (8,108)
Trade and other payables (145) (150)
lease liabilities (572) (606)
Secured bank loans (5) (5)
Unsecured bank loans 0  
Unsecured other loans (198) (132)
Bank overdraft 0  
Non-derivative financial liabilities (9,972) (9,001)
Derivative financial assets/(liabilities)    
Equity derivatives 0  
Foreign exchange derivatives (51) (59)
Cross currency interest rate swaps (47) (51)
Interest rate swaps 0  
Commodity derivatives 0  
Derivative financial assets/(liabilities) (98) (111)
Of which: related to cash flow hedges (27) (24)
2-3 years [member]    
Non-derivative financial liabilities    
Unsecured bond issues (6,022) (6,398)
Trade and other payables (195) (177)
lease liabilities (385) (448)
Secured bank loans (5) (4)
Unsecured bank loans 0  
Unsecured other loans (13) (12)
Bank overdraft 0  
Non-derivative financial liabilities (6,620) (7,039)
Derivative financial assets/(liabilities)    
Equity derivatives 0  
Foreign exchange derivatives (96)  
Cross currency interest rate swaps (89) (32)
Interest rate swaps 0  
Commodity derivatives 0  
Derivative financial assets/(liabilities) (185) (32)
Of which: related to cash flow hedges (2) 0
3-5 years [member]    
Non-derivative financial liabilities    
Unsecured bond issues (10,562) (11,951)
Trade and other payables (248) (277)
lease liabilities (407) (447)
Secured bank loans (5) (9)
Unsecured bank loans 0  
Unsecured other loans 0 (2)
Bank overdraft 0  
Non-derivative financial liabilities (11,223) (12,686)
Derivative financial assets/(liabilities)    
Equity derivatives 0  
Foreign exchange derivatives 0 (87)
Cross currency interest rate swaps 0 (18)
Interest rate swaps 0  
Commodity derivatives 0  
Derivative financial assets/(liabilities) 0 (105)
Of which: related to cash flow hedges 0 (5)
Greater than 5 years [member]    
Non-derivative financial liabilities    
Unsecured bond issues (82,259) (86,573)
Trade and other payables (757) (532)
lease liabilities (425) (501)
Secured bank loans 0 0
Unsecured bank loans 0  
Unsecured other loans (8) (10)
Bank overdraft 0  
Non-derivative financial liabilities (83,450) (87,617)
Derivative financial assets/(liabilities)    
Equity derivatives 0  
Foreign exchange derivatives 0  
Cross currency interest rate swaps (94) (44)
Interest rate swaps 0 0
Commodity derivatives 0  
Derivative financial assets/(liabilities) (94) (44)
Of which: related to cash flow hedges (8) (6)
Carrying amount [member]    
Non-derivative financial liabilities    
Unsecured bond issues (69,361) (70,199)
Trade and other payables (25,633) (26,324)
lease liabilities (2,236) (2,397)
Secured bank loans (16) (18)
Commercial papers (200)  
Unsecured bank loans (222) (178)
Unsecured other loans (254) (221)
Bank overdraft (29) (14)
Non-derivative financial liabilities (97,951) (99,351)
Derivative financial assets/(liabilities)    
Equity derivatives (3,206) (5,481)
Foreign exchange derivatives (686) (563)
Cross currency interest rate swaps (300) (205)
Interest rate swaps (114) (102)
Commodity derivatives (107) (46)
Derivative financial assets/(liabilities) (4,412) (6,397)
Of which: related to cash flow hedges (510) (460)
Contractual cash flows [member]    
Non-derivative financial liabilities    
Unsecured bond issues (113,113) (115,992)
Trade and other payables (26,007) (26,547)
lease liabilities (2,504) (2,706)
Secured bank loans (19) (23)
Commercial papers (200)  
Unsecured bank loans (222) (178)
Unsecured other loans (267) (239)
Bank overdraft (29) (14)
Non-derivative financial liabilities (142,362) (145,700)
Derivative financial assets/(liabilities)    
Equity derivatives (3,206) (5,481)
Foreign exchange derivatives (686) (563)
Cross currency interest rate swaps (300) (205)
Interest rate swaps (114) (102)
Commodity derivatives (107) (46)
Derivative financial assets/(liabilities) (4,412) (6,397)
Of which: related to cash flow hedges $ (510) $ (460)