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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
Sep. 30, 2018
Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Inventories $ 4,866 $ 4,924
Property, plant and equipment, net 7,101 7,673
Goodwill 27,585 28,414
Total assets 65,061 70,615
Total liabilities of the disposal group classified as held for sale in the consolidated balance sheets 45,927 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 41 16
Identifiable intangible assets, net   236
Goodwill 40 275
Total assets $ 81 566
Other taxes and long-term liabilities   38
Total liabilities of the disposal group classified as held for sale in the consolidated balance sheets   $ 38