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Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period $ 12,069  
Additions 1,265 $ 1,474
Property, plant and equipment at end of period 12,263 12,069
Commitments for purchases of property, plant and equipment 256 220
Capitalized borrowing costs 2 4
Gross carrying amount    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 26,999 34,028
Costs of assets related to discontinued operations   (5,009)
Decrease through reclassification to right-of-use assets   (127)
Cost of assets reclassified out of assets of disposal group held for sale 332 (23)
Impact of business combinations 26 44
Additions 1,265 1,474
Disposals and derecognitions (2,201) (3,409)
Currency translation effects 1,797 21
Property, plant and equipment at end of period 28,218 26,999
Accumulated depreciation, amortisation and impairment    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period (14,930) (18,332)
Costs of assets related to discontinued operations   2,118
Decrease through reclassification to right-of-use assets   26
Accumulated depreciation on assets reclassified out of assets of disposal group held for sale (163) 2
Accumulated depreciation on disposals and derecognitions 2,004 2,846
Depreciation charge (1,318) (1,345)
Impairment charge (447) (205)
Reversal of impairment charge 7 3
Currency translation effects (1,108) (43)
Property, plant and equipment at end of period (15,955) (14,930)
Depreciation charge prior to classification to assets held for sale (38) 0
Impairment charge prior to classification to assets held for sale   (2)
Land    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 492  
Property, plant and equipment at end of period 536 492
Land | Gross carrying amount    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 512 696
Costs of assets related to discontinued operations   (61)
Decrease through reclassification to right-of-use assets   (122)
Cost of assets reclassified out of assets of disposal group held for sale 11  
Impact of business combinations 2 10
Reclassifications 10 57
Additions 7 6
Disposals and derecognitions (23) (75)
Currency translation effects 36 1
Property, plant and equipment at end of period 555 512
Land | Accumulated depreciation, amortisation and impairment    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period (20) (43)
Costs of assets related to discontinued operations   8
Decrease through reclassification to right-of-use assets   26
Accumulated depreciation on assets reclassified out of assets of disposal group held for sale 0  
Accumulated depreciation on disposals and derecognitions 17  
Depreciation charge 0  
Impairment charge (15) (10)
Currency translation effects (1) (1)
Property, plant and equipment at end of period (19) (20)
Buildings    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 6,339  
Property, plant and equipment at end of period 6,570 6,339
Buildings | Gross carrying amount    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 11,463 14,135
Costs of assets related to discontinued operations   (1,615)
Decrease through reclassification to right-of-use assets   (3)
Cost of assets reclassified out of assets of disposal group held for sale 117 (3)
Impact of business combinations 19 24
Reclassifications 433 332
Additions 115 112
Disposals and derecognitions (465) (1,551)
Currency translation effects 695 32
Property, plant and equipment at end of period 12,377 11,463
Buildings | Accumulated depreciation, amortisation and impairment    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period (5,124) (6,328)
Costs of assets related to discontinued operations   562
Accumulated depreciation on assets reclassified out of assets of disposal group held for sale (58) 2
Accumulated depreciation on disposals and derecognitions 433 1,170
Depreciation charge (491) (447)
Impairment charge (194) (51)
Reversal of impairment charge   1
Currency translation effects (373) (33)
Property, plant and equipment at end of period (5,807) (5,124)
Depreciation charge prior to classification to assets held for sale (20)  
Construction in progress    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 1,290  
Property, plant and equipment at end of period 1,182 1,290
Construction in progress | Gross carrying amount    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 1,350 2,042
Costs of assets related to discontinued operations   (655)
Cost of assets reclassified out of assets of disposal group held for sale 36 (12)
Impact of business combinations   1
Reclassifications (1,038) (1,019)
Additions 847 1,001
Disposals and derecognitions (57) (9)
Currency translation effects 110 1
Property, plant and equipment at end of period 1,248 1,350
Construction in progress | Accumulated depreciation, amortisation and impairment    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period (60) (37)
Costs of assets related to discontinued operations   7
Accumulated depreciation on assets reclassified out of assets of disposal group held for sale (4)  
Accumulated depreciation on disposals and derecognitions 11 2
Impairment charge (10) (34)
Reversal of impairment charge   2
Currency translation effects (3)  
Property, plant and equipment at end of period (66) (60)
Machinery and other equipment    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 3,948  
Property, plant and equipment at end of period 3,975 3,948
Machinery and other equipment | Gross carrying amount    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period 13,674 17,155
Costs of assets related to discontinued operations   (2,678)
Decrease through reclassification to right-of-use assets   (2)
Cost of assets reclassified out of assets of disposal group held for sale 168 (8)
Impact of business combinations 5 9
Reclassifications 595 630
Additions 296 355
Disposals and derecognitions (1,656) (1,774)
Currency translation effects 956 (13)
Property, plant and equipment at end of period 14,038 13,674
Machinery and other equipment | Accumulated depreciation, amortisation and impairment    
Movements of property, plant and equipment [roll forward]    
Property, plant and equipment at beginning of period (9,726) (11,924)
Costs of assets related to discontinued operations   1,541
Accumulated depreciation on assets reclassified out of assets of disposal group held for sale (101)  
Accumulated depreciation on disposals and derecognitions 1,543 1,674
Depreciation charge (827) (898)
Impairment charge (228) (110)
Reversal of impairment charge 7  
Currency translation effects (731) (9)
Property, plant and equipment at end of period (10,063) $ (9,726)
Depreciation charge prior to classification to assets held for sale $ (18)