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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]
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