Certain Transactions - Business Acquisitions - Summary of Major Classes of Assets and Liabilities Included as Held for Sale (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Business Combinations [Abstract]
Inventories	$ 0	$ 146
Property, plant and equipment, net and others	99	312
Goodwill	2	27
Adjustments of assets held for sale to fair value	(14)	(296)
Total assets of the disposal group classified as held for sale in the consolidated balance sheets	$ 87	$ 189