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Fair Value Measurement - Summary of Financial Items Carried at Fair Value (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration | [1] | $ (268) |  | $ (460)
Total |  | 2,153 |  | 1,540
Asset Derivatives - Options and Forward Contracts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  | 24 |  | 32
Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  |  | (22)
Liabilities Derivatives Options and Forward Contracts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  | (79) |  | (41)
Money Markets [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents |  | 367 |  | 577
Cash, Deposits and Other [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents |  | 1,810 |  | 1,398
Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment in securities |  | 284 | [2] | 42
Other, Mainly Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment in securities |  | 15 |  | 14
Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total |  | 2,207 |  | 2,019
Level 1 [Member] | Money Markets [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents |  | 367 |  | 577
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 |  | 1,810 |  | 1,398
Level 1 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment in securities |  | 25 | [2] | 42
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 |  | 2
Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total |  | 204 |  | (31)
Level 2 [Member] | Asset Derivatives - Options and Forward Contracts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  | 24 |  | 32
Level 2 [Member] | Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  |  |  | (22)
Level 2 [Member] | Liabilities Derivatives Options and Forward Contracts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivatives |  | (79) |  | (41)
Level 2 [Member] | Equity Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment in securities | [2] | 259 |  |
Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Contingent consideration | [1] | (268) |  | (460)
Total |  | (258) |  | (448)
Level 3 [Member] | Other, Mainly Debt Securities [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Investment in securities |  | $ 10 |  | $ 12
[1] | Contingent consideration represents liabilities recorded at fair value in connection with acquisitions.
[2] | During the third quarter of 2020, Teva recorded a gain of $134 million under share in profits of associated companies, net, reflecting the difference between the book value of Teva’s investment in American Well and its fair value as of the date it completed its initial public offering in September 2020. The investment was reclassified from “investment in associated companies” to “investment in marketable securities,” since Teva no longer had significant influence in American Well. This represented a transfer into Level 3 measurement within fair value hierarchy. By December 31, 2020, Teva recorded an additional gain of $80 million under financial expenses, net, reflecting the revaluation gain of this security as of December 31, 2020 and transferred it to Level 2 measurement within fair value hierarchy due to a change in discount rate. Due to management’s intention and ability to sell this security in the next twelve months, the balance as of December 31, 2020 was reclassified to short term investments.

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