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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	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Business Combinations [Abstract]
Inventories	$ 7	$ 146
Property, plant and equipment, net and others	55	312
Goodwill	9	27
Adjustments of assets held for sale to fair value	(42)	(296)
Total assets of the disposal group classified as held for sale in the consolidated balance sheets	$ 29	$ 189

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