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Certain Transactions - Business Acquisitions - Summary of Major Classes of Assets and Liabilities Included as Held for Sale (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Inventories $ 4,731 $ 4,924  
Property, plant and equipment, net 6,868 7,673  
Goodwill 24,917 28,414 $ 44,409
Total assets 60,683 70,615  
Total liabilities of the disposal group classified as held for sale in the consolidated balance sheets 44,889 51,870  
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Inventories   39  
Property, plant and equipment, net 72 16  
Identifiable intangible assets, net   236  
Goodwill 20 275  
Total assets $ 92 566  
Other taxes and long-term liabilities   38  
Total liabilities of the disposal group classified as held for sale in the consolidated balance sheets   $ 38