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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, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Inventories $ 5,113 $ 4,924
Property, plant and equipment, net 7,420 7,673
Goodwill 28,465 28,414
Total assets 69,181 70,615
Total liabilities of the disposal group classified as held for sale in the consolidated balance sheets 49,079 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 17 16
Identifiable intangible assets, net   236
Goodwill   275
Total assets $ 17 566
Other taxes and long-term liabilities   38
Total liabilities of the disposal group classified as held for sale in the consolidated balance sheets   $ 38