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Contingencies and commitments (Details) $ in Millions								9 Months Ended
	Oct. 18, 2017 patent	Oct. 07, 2017 patent	Oct. 06, 2017 patent	Oct. 05, 2017 defendants	Sep. 22, 2017 USD ($)	Sep. 14, 2017 lawsuit	Aug. 24, 2017 lawsuit	Sep. 30, 2017 lawsuit
Sensipar (cinacalcet) Patent Litigation [Member]
Loss Contingencies [Line Items]
Gain contingency, number of lawsuits filed								18
KYPROLIS (carfilzomib) Patent Litigation [Member]
Loss Contingencies [Line Items]
Gain contingency, number of lawsuits filed						3	2	10
Sensipar (cinacalcet) Patent Litigation, Consolidated by Delaware District Court [Member]
Loss Contingencies [Line Items]
Gain contingency, number of lawsuits filed								15
Epoetin Alfa Litigation [Member]
Loss Contingencies [Line Items]
Litigation settlement, length of trial					5 days
Litigation settlement, amount awarded from other party | $					$ 70
Subsequent event [Member] | Sanofi/Regeneron [Member]
Loss Contingencies [Line Items]
Loss contingency, number of defendants | defendants				2
Subsequent event [Member] | Mvasi Patent Litigation, Genentech, Inc. (Genentech) and the City of Hope [Member]
Loss Contingencies [Line Items]
Gain contingency, patents allegedly infringed upon, number | patent			27
Loss contingency, patents allegedly infringed, number | patent	25	24

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- Definition

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