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Significant transactions (Details 3) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Assets of disposal group classified as held for sale [abstract]    
Property, plant and equipment $ 12,263 $ 12,069
Intangible assets other than goodwill 36,809 28,787
Deferred tax assets 8,214 7,909
Other non-current assets 892 738
Inventories 7,131 5,982
Other current assets 2,523 2,680
Assets of disposal group held for sale   841
Liabilities of disposal group classified as held for sale [abstract]    
Deferred tax liabilities 7,422 5,867
Provisions and other non-current liabilities 6,934 6,632
Provisions and other current liabilities $ 15,127 13,338
Liabilities of disposal group held for sale   31
Assets and liabilities classified as held for sale [member]    
Assets of disposal group classified as held for sale [abstract]    
Property, plant and equipment   169
Intangible assets other than goodwill   475
Deferred tax assets   11
Other non-current assets   2
Inventories   181
Other current assets   3
Assets of disposal group held for sale   841
Liabilities of disposal group classified as held for sale [abstract]    
Deferred tax liabilities   2
Provisions and other non-current liabilities   4
Provisions and other current liabilities   25
Liabilities of disposal group held for sale   $ 31