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Assets and liabilities held for sale - Summary of major classes of assets and liabilities classified as held for sale (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets      
Intangible assets $ 2,779 $ 3,119 $ 3,279
Property, plant and equipment 56,361 62,093 $ 58,855
Investments in equity accounted units 4,299 4,486  
Deferred tax assets 3,137 3,395  
Cash and cash equivalents 10,773 10,550  
Liabilities      
Liabilities of disposal groups held for sale (294) (124)  
Net assets 49,823 51,115  
Assets and liabilities classified as held for sale [member]      
Assets      
Intangible assets 4 6  
Property, plant and equipment 238 190  
Investments in equity accounted units 5    
Inventories 186 88  
Deferred tax assets 66 49  
Trade and other receivables 58 139  
Other financial assets (including loans to equity accounted units) 60 22  
Cash and cash equivalents 117    
Assets of disposal groups held for sale 734 494  
Liabilities      
Trade and other payables (134) (60)  
Provisions including post-retirement benefits (160) (64)  
Liabilities of disposal groups held for sale (294) (124)  
Net assets $ 440 $ 370