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Contingencies - Patent Litigation - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 36 Months Ended 84 Months Ended
Jan. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2026
Dec. 31, 2023
Anti-PD-1 Antibody Patent Case          
Loss Contingencies [Line Items]          
Payment under settlement and license agreement $ 625        
Anti-PD-1 Antibody Patent Case | Forecast          
Loss Contingencies [Line Items]          
Royalty rate (as percent)       2.50% 6.50%
Gilead Patent Case          
Loss Contingencies [Line Items]          
Percentage of settlement to be paid to third-party (as percent)     20.00%    
Amount awarded to company   $ 2,540 $ 200