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Property, Plant and Equipment - Detailed Information About Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance $ 27,544  
Ending balance 24,718 $ 27,544
Carrying amount 24,718 27,544
Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 48,757 47,969
Effect of movements in foreign exchange (4,190) (485)
Acquisitions 1,259 4,451
Acquisitions through business combinations 3 24
Disposals (409) (1,987)
Disposals through the sale of subsidiaries 0 (4)
Transfer (to)/from other asset categories and other movements (180) (1,211)
Ending balance 45,239 48,757
Carrying amount 45,239 48,757
Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (23,242) (22,331)
Effect of movements in foreign exchange 1,788 310
Depreciation (1,613) (3,370)
Disposals 369 1,734
Disposals through the sale of subsidiaries 0 3
Impairment losses (26) (87)
Transfer (to)/from other asset categories and other movements 153 499
Ending balance (22,571) (23,242)
Carrying amount (22,571) (23,242)
Land and buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 8,612  
Ending balance 7,794 8,612
Carrying amount 7,794 8,612
Land and buildings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 12,216  
Effect of movements in foreign exchange (1,043)  
Acquisitions 6  
Acquisitions through business combinations 0  
Disposals (16)  
Disposals through the sale of subsidiaries 0  
Transfer (to)/from other asset categories and other movements 211  
Ending balance 11,374 12,216
Carrying amount 11,374 12,216
Land and buildings [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (3,604)  
Effect of movements in foreign exchange 237  
Depreciation (194)  
Disposals 4  
Disposals through the sale of subsidiaries 0  
Impairment losses 0  
Transfer (to)/from other asset categories and other movements (24)  
Ending balance (3,581) (3,604)
Carrying amount (3,581) (3,604)
Plant and Equipment Fixtures and Fittings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 14,743  
Ending balance 13,097 14,743
Carrying amount 13,097 14,743
Plant and Equipment Fixtures and Fittings [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 34,381  
Effect of movements in foreign exchange (2,908)  
Acquisitions 382  
Acquisitions through business combinations 3  
Disposals (394)  
Disposals through the sale of subsidiaries 0  
Transfer (to)/from other asset categories and other movements 623  
Ending balance 32,087 34,381
Carrying amount 32,087 34,381
Plant and Equipment Fixtures and Fittings [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance (19,638)  
Effect of movements in foreign exchange 1,551  
Depreciation (1,419)  
Disposals 365  
Disposals through the sale of subsidiaries 0  
Impairment losses (26)  
Transfer (to)/from other asset categories and other movements 177  
Ending balance (18,990) (19,638)
Carrying amount (18,990) (19,638)
Under construction [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,160  
Ending balance 1,778 2,160
Carrying amount 1,778 2,160
Under construction [member] | Acquisition cost [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 2,160  
Effect of movements in foreign exchange (239)  
Acquisitions 871  
Acquisitions through business combinations 0  
Disposals 0  
Disposals through the sale of subsidiaries 0  
Transfer (to)/from other asset categories and other movements (1,014)  
Ending balance 1,778 2,160
Carrying amount 1,778 2,160
Under construction [member] | Depreciation and impairment losses [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 0  
Effect of movements in foreign exchange 0  
Depreciation 0  
Disposals 0  
Disposals through the sale of subsidiaries 0  
Impairment losses 0  
Transfer (to)/from other asset categories and other movements 0  
Ending balance 0 0
Carrying amount 0 0
Property, plant and equipment owned [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning balance 25,515  
Ending balance 22,669 25,515
Carrying amount $ 22,669 $ 25,515