Contingencies and commitments (Repatha Patent Litigation) (Details) - Sanofi/Regeneron Patent Litigation - patent					1 Months Ended
	Mar. 24, 2020	Dec. 06, 2017	Jan. 12, 2017	Mar. 18, 2016	Oct. 31, 2014
Other Commitments [Line Items]
Number of patents allegedly infringed		2	2		7
Length of trial				5 years
Forecast
Other Commitments [Line Items]
Length of trial	2 days