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Licensing, Acquisitions, and Other Arrangements - Proposed Acquisition of Allergan plc (Details) - USD ($)
$ / shares in Units, $ in Billions
3 Months Ended
Mar. 31, 2020
Jan. 01, 2020
Jun. 24, 2019
Business Acquisition      
Closing price of AbbVie's common stock     $ 78.45
Scenario, forecast | Allergan plc      
Business Acquisition      
Total consideration $ 63    
Shares of AbbVie stock received by Allergan shareholders   0.8660  
Cash per share received by Allergan shareholders   $ 120.30