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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Property, Plant and Equipment Owned and Leased Assets
Property, plant and equipment comprises owned and leased assets, as follows:
 
Million US dollar
   
31 December 2021
     
31 December 2020
  
Property, plant and equipment owned
      24 459        24 191  
Property, plant and equipment leased
(right-of-use
assets)
      2 219        2 228  
    
 
 
     
 
 
  
Total property, plant and equipment
   
 
26 678
     
 
26 419
  
    
 
 
     
 
 
  
Summary of Property, Plant and Equipment
    
31 December 2021
    
31 December

2020
  
Million US dollar
   
Land and

buildings
    
Plant and

equipment,

fixtures and

fittings
    
Under

construction
    
Total
    
Total
  
Acquisition cost
                                         
Balance at end of previous year
   
 
12 237
    
 
34 976
    
 
1 780
    
 
48 993
    
 
48 757
  
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Effect of movements in foreign exchange
      (383 )      (1 162 )      (70 )      (1 616 )      (1 644 ) 
Acquisitions
      44       1 296       3 399       4 739       3 188  
Acquisitions through business combinations
      (0 )      2       0       2       111  
Disposals through sale and derecognition
      (104 )     
(1 197
 )      (1 )     
(1 301
 )     
(1 274
 ) 
Disposals through the sale of subsidiaries
      (18 )      (33 )      —         (51 )      —    
Transfer (to)/from other asset categories and other movements¹
      598       2 025       (2 646 )      (23 )      (145 ) 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Balance at end of the period
   
 
12 374
    
 
35 906
    
 
2 462
    
 
50 742
    
 
48 993
  
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Depreciation and impairment losses
                                         
Balance at end of previous year
   
 
(3 950
) 
  
 
(20 852
) 
  
 
—  
 
  
 
(24 802
) 
  
 
(23 242
) 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Effect of movements in foreign exchange
      123       690       —         813       625  
Depreciation
      (376 )      (3 008 )      —         (3 384 )      (3 250 ) 
Disposals through sale and derecognition
      64      
1 104

       —        
1 168
      
1 130
  
Disposals through the sale of subsidiaries
      17       29       —         46       —    
Impairment losses
      (19 )      (161 )      (2 )      (182 )      (145 ) 
Transfer to/(from) other asset categories and other movements
1
      (151 )      206       2       57       80  
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Balance at end of the period
   
 
(4 292
) 
  
 
(21 992
) 
  
 
—  
 
  
 
(26 284
) 
  
 
(24 802
) 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Carrying amount
                                         
at 31 December 2020
   
 
8 287
    
 
14 124
    
 
1 780
    
 
24 191
    
 
24 191
  
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
at 31 December 2021
   
 
8 082
    
 
13 915
    
 
2 462
    
 
24 459
    
 
—  
 
    
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Summary of Property, Plant and Equipment Leased (right- of- use assets)
Property, plant and equipment leased by the company
(right-of-use
assets) is detailed as follows:
 
    
2021
  
Million US dollar
   
Land and

buildings
     
Machinery,

equipment and

other
     
Total
  
Net carrying amount at 31 December
      1 696        523     
 
2 219
  
Depreciation for the year ended 31 December
      (373 )       (201 )    
 
(574
) 
   
    
2020
  
Million US dollar
   
Land and
buildings
     
Machinery,

equipment and

other
     
Total
  
Net carrying amount at 31 December
      1 726        502     
 
2 228
  
Depreciation for the year ended 31 December
      (343 )       (156 )    
 
(499
)