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Fair Value Measurement - Summary of Fair Value of Financial Liabilities Measured Using Level 3 Inputs (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 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 (616) (264)
Allergan transaction [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjustments to provisions for contingent consideration [1] (239) (88)
Settlement of contingent consideration 102 57
Eagle Transaction [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjustments to provisions for contingent consideration (31) (24)
Settlement of contingent consideration 28 40
Novetide transaction [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Adjustments to provisions for contingent consideration (1) (1)
Settlement of contingent consideration $ 2 $ 2
[1] The financial data presented in the tables above with respect to adjustments to provisions for contingent consideration related to Allergan for the six months ended June 30, 2023 have been revised as discussed in note 1c.