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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, 2019
Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Property, plant and equipment, net $ 6,643 $ 6,868
Goodwill [1] 24,657 24,917
Total assets 57,246 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]    
Property, plant and equipment, net 24 92
Goodwill   51
Adjustments of assets held for sale to fair value (6) (51)
Total assets $ 18 $ 92
[1] Accumulated goodwill impairment as of September 30, 2019 and January 1, 2019 was approximately $21.0 billion.