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Property, Machinery and Equipment, Net and Assets For The Right-Of-Use, Net - Consolidated Assets For The Right-Of-Use (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period $ 1,285    
Reclassifications (88) $ (402) $ 6
Foreign currency translation effects 217 (231) (307)
Net book value at Ending of period 1,243 1,285  
Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 1,285 1,222 1,193
Additions of new leases 213 274 296
Cancellations and remeasurements (76) (52) (9)
Business combinations 13    
Reclassifications   35  
Depreciation (239) (288) (219)
Foreign currency translation effects 47 94 (39)
Net book value at Ending of period 1,243 1,285 1,222
Gross carrying amount [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 2,265 2,073 1,881
Net book value at Ending of period 2,389 2,265 2,073
Accumulated depreciation and amortisation [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period (980) (851) (688)
Net book value at Ending of period (1,146) (980) (851)
Land [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 249 301  
Additions of new leases 42 25  
Cancellations and remeasurements (7) (6)  
Business combinations 13    
Reclassifications   (5)  
Depreciation (28) (29)  
Foreign currency translation effects 1 (37)  
Net book value at Ending of period 270 249 301
Land [member] | Gross carrying amount [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 366 384  
Net book value at Ending of period 409 366 384
Land [member] | Accumulated depreciation and amortisation [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period (117) (83)  
Net book value at Ending of period (139) (117) (83)
Building [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Reclassifications (1) (23)  
Foreign currency translation effects 42 (133)  
Building [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 238 128  
Additions of new leases 38 52  
Cancellations and remeasurements (17) (6)  
Reclassifications   65  
Depreciation (35) (39)  
Foreign currency translation effects (20) 38  
Net book value at Ending of period 204 238 128
Building [member] | Gross carrying amount [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 471 393  
Net book value at Ending of period 457 471 393
Building [member] | Accumulated depreciation and amortisation [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period (233) (265)  
Net book value at Ending of period (253) (233) (265)
Machinery And Equipment [Member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Reclassifications (56) (203)  
Foreign currency translation effects 57 (364)  
Machinery And Equipment [Member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 792 790  
Additions of new leases 127 193  
Cancellations and remeasurements (51) (40)  
Reclassifications   (25)  
Depreciation (173) (219)  
Foreign currency translation effects 63 93  
Net book value at Ending of period 758 792 790
Machinery And Equipment [Member] | Gross carrying amount [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 1,417 1,289  
Net book value at Ending of period 1,502 1,417 1,289
Machinery And Equipment [Member] | Accumulated depreciation and amortisation [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period (625) (499)  
Net book value at Ending of period (744) (625) (499)
Other assets [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 6 3  
Additions of new leases 6 4  
Cancellations and remeasurements (1)    
Depreciation (3) (1)  
Foreign currency translation effects 3    
Net book value at Ending of period 11 6 3
Other assets [member] | Gross carrying amount [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period 11 7  
Net book value at Ending of period 21 11 7
Other assets [member] | Accumulated depreciation and amortisation [member] | Right-of-use assets [member]      
Disclosure of quantitative information about right-of-use assets [line items]      
Net book value at beginning of period (5) (4)  
Net book value at Ending of period $ (10) $ (5) $ (4)