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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Property, plant and equipment, net		$ 6,436	$ 6,868
Goodwill	[1]	24,846	24,917	$ 28,414
Total assets		57,470	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		98	92
Goodwill			51
Adjustments of assets held for sale to fair value		(11)	(51)
Total assets		$ 87	$ 92
[1] Accumulated goodwill impairment as of December 31, 2019, December 31, 2018 and January 1, 2018 was approximately $21.0 billion, $21.0 billion and $18.0 billion, respectively.

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Amount of adjustments in assets held for sale long lived fair value.

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