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Legal Settlements and Loss Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Loss Contingencies [Line Items]
Legal settlements and loss contingencies, expense	$ 21	$ 468	$ 10	$ 1,171
Accrued amount for legal settlements and loss contingencies	$ 1,624		$ 1,624		$ 1,580
Settlement On Account Of Product Liability [Member] \| United States [Member]
Loss Contingencies [Line Items]
Restructuring expense and income			The expense in the first nine months of 2020 was mainly related to an increase of a reserve for certain legal expenses and settlement contributions related to product liability claims in the United States and partially settling antitrust claims challenging a patent settlement agreement, partially offset by proceeds received following a settlement of the FCPA derivative proceedings in Israel and settlement of an action brought against the sellers of Auden McKenzie (an acquisition made by Actavis Generics).The expense in the first nine months of 2019 was mainly related to an estimated settlement provision recorded in connection with the opioid cases.