Fair Value Measurement - Summary of Financial Items Carried at Fair Value (Detail) - USD ($) $ in Millions		Mar. 31, 2021		Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	[1]	$ (246)		$ (268)
Total		1,725		2,153
Asset Derivatives - Options and Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives		63		24
Liabilities Derivatives Options and Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives		(23)		(79)
Money Markets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		120		367
Cash, Deposits and Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		1,623		1,810
Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in securities		182	[2]	284
Other, Mainly Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in securities		6		15
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total		1,930		2,207
Level 1 [Member] | Money Markets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		120		367
Level 1 [Member] | Cash, Deposits and Other [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents		1,623		1,810
Level 1 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in securities		182	[2]	25
Level 1 [Member] | Other, Mainly Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in securities		5		5
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total		40		204
Level 2 [Member] | Asset Derivatives - Options and Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives		63		24
Level 2 [Member] | Liabilities Derivatives Options and Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives		(23)		(79)
Level 2 [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in securities				259
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	[1]	(246)		(268)
Total		(245)		(258)
Level 3 [Member] | Other, Mainly Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in securities		$ 1		$ 10

[1] Contingent consideration represents liabilities recorded at fair value in connection with acquisitions.

[2] As of March 31, 2021, Teva’s shares in American Well Corporation (“American Well”) moved from a Level 2 measurement to Level 1 measurement within the fair value hierarchy, since they are no longer subject to a sale restriction.