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Contingencies - Patent Litigation - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended 36 Months Ended 84 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2026
Dec. 31, 2023
Anti-PD-1 Antibody Patent Case          
Loss Contingencies [Line Items]          
Judgement awarded to (against) Merck     $ (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]          
Judgment awarded to Merck $ 2,540 $ 200      
Percentage of settlement to be paid to third-party (as percent)   20.00%