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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Assets      
Intangible assets $ 2,637 $ 2,779 $ 3,119
Property, plant and equipment 56,307 56,361 62,093
Investments in equity accounted units 3,971 4,299  
Deferred tax assets 3,102 3,137 $ 3,137
Cash and cash equivalents 8,027 10,773  
Liabilities      
Liabilities of disposal groups held for sale 0 (294)  
Net assets $ 45,242 49,823  
Assets and liabilities classified as held for sale [Member]      
Assets      
Intangible assets   4  
Property, plant and equipment   238  
Investments in equity accounted units   5  
Inventories   186  
Deferred tax assets   66  
Trade and other receivables   58  
Other financial assets (including loans to equity accounted units)   60  
Cash and cash equivalents   117  
Assets of disposal groups held for sale   734  
Liabilities      
Trade and other payables   (134)  
Provisions including post-retirement benefits   (160)  
Liabilities of disposal groups held for sale   (294)  
Net assets   $ 440