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Fair Value Measurement - Summary of Fair Value of Financial Liabilities Measured Using Level 3 Inputs (Detail) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value at the beginning of the period |  | $ (477) | $ (250)
Fair value at the end of the period |  | (552) | (159)
Allergan transaction [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Adjustments to provisions for contingent consideration | [1] | (267) | (111)
Settlement of contingent consideration |  | 227 | 132
Eagle Transaction [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Adjustments to provisions for contingent consideration |  | (37) | (35)
Settlement of contingent consideration |  | 41 | 61
Novetide transaction [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Adjustments to provisions for contingent consideration |  | (1) | 2
Settlement of contingent consideration |  | 2 | 2
Redemption Of Convertible Debt Security [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Redemption of convertible bond security | [2] | $ (40) |
Conversion Option [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Conversion option** | [2] |  | 15
Convertible Debt Securities [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment in convertible bond | [2] |  | $ 25
[1] | The financial data presented in the tables above with respect to adjustments to provisions for contingent consideration related to Allergan for the nine months ended September 30, 2023 have been revised as discussed in note 1c.
[2] | On September 29, 2023, Teva purchased $40 million of subordinated convertible bonds of Alvotech. On June 26, 2024, Alvotech announced its intention to exercise its redemption rights and redeemed the convertible bonds, which were paid to Teva in July 2024 (see note 2).

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