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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
Mar. 31, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Inventories $ 4,782 $ 4,731
Property, plant and equipment, net 6,785 6,868
Goodwill 24,822 24,917
Total assets 59,854 60,683
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 25  
Property, plant and equipment, net 114 92
Identifiable intangible assets, net 13 0
Goodwill 79 51
Adjustments of assets held for sale to fair value (69) (51)
Total assets $ 162 $ 92