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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	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Business Combinations [Abstract]
Inventories	$ 146	$ 0
Property, plant and equipment, net and others	312	98
Goodwill	27	0
Adjustments of assets held for sale to fair value	(296)	(11)
Total assets of the disposal group classified as held for sale in the consolidated balance sheets	$ 189	$ 87

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