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Intangible Assets - Summary of Intangible Assets (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year $ 42,452  
Ending balance 40,049 $ 42,452
Amortization and impairment losses [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year (3,656) (3,634)
Effect of movements in foreign exchange 225 41
Amortization (352) (622)
Impairment (150)  
Disposals 5 254
Disposals through the sale of subsidiaries 0 0
Transfer (to)/from other asset categories and other movements 107 305
Ending balance (3,821) (3,656)
Acquisition cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 46,108 48,465
Effect of movements in foreign exchange (2,470) (79)
Acquisitions through business combinations 14 99
Acquisitions and expenditures 287 631
Disposals (6) (259)
Disposals through the sale of subsidiaries   (29)
Transfer (to)/from other asset categories and other movements (63) (2,720)
Ending balance 43,870 46,108
Brands [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 40,042  
Ending balance 37,949 40,042
Brands [member] | Amortization and impairment losses [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year (32)  
Disposals through the sale of subsidiaries 0  
Ending balance (32) (32)
Brands [member] | Acquisition cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 40,074  
Effect of movements in foreign exchange (2,107)  
Acquisitions through business combinations 14  
Ending balance 37,981 40,074
Commercial intangibles [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 1,179  
Ending balance 1,278 1,179
Commercial intangibles [member] | Amortization and impairment losses [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year (1,595)  
Effect of movements in foreign exchange 85  
Amortization (148)  
Disposals 4  
Disposals through the sale of subsidiaries 0  
Transfer (to)/from other asset categories and other movements (9)  
Ending balance (1,663) (1,595)
Commercial intangibles [member] | Acquisition cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 2,774  
Effect of movements in foreign exchange (132)  
Acquisitions and expenditures 174  
Disposals (5)  
Transfer (to)/from other asset categories and other movements 130  
Ending balance 2,941 2,774
Software [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 743  
Ending balance 649 743
Software [member] | Amortization and impairment losses [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year (1,851)  
Effect of movements in foreign exchange 126  
Amortization (177)  
Disposals 1  
Disposals through the sale of subsidiaries 0  
Transfer (to)/from other asset categories and other movements 17  
Ending balance (1,884) (1,851)
Software [member] | Acquisition cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 2,594  
Effect of movements in foreign exchange (194)  
Acquisitions and expenditures 19  
Disposals (1)  
Transfer (to)/from other asset categories and other movements 115  
Ending balance 2,533 2,594
Other [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 488  
Ending balance 173 488
Other [member] | Amortization and impairment losses [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year (178)  
Effect of movements in foreign exchange 14  
Amortization (27)  
Impairment (150)  
Disposals through the sale of subsidiaries 0  
Transfer (to)/from other asset categories and other movements 99  
Ending balance (241) (178)
Other [member] | Acquisition cost [member]    
Disclosure of detailed information about intangible assets [line items]    
Balance at end of previous year 666  
Effect of movements in foreign exchange (37)  
Acquisitions and expenditures 94  
Transfer (to)/from other asset categories and other movements (308)  
Ending balance $ 415 $ 666