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Licensing, Acquisitions, and Other Arrangements - Acquisition of Allergan (Details)
$ in Millions
6 Months Ended
Jun. 30, 2021
USD ($)
Business Acquisition  
Goodwill, Purchase Accounting Adjustments $ 564 [1]
Allergan plc  
Business Acquisition  
Intangible assets measurement period adjustments 710
Deferred income tax liabilities measurement period adjustments 148
Other net measurement period adjustments 2
Goodwill, Purchase Accounting Adjustments $ 564
[1] (a) Measurement period adjustments relate to the acquisition of Allergan (see Note 4).