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Segment information (Details Textual)
 12 Months Ended
Dec. 31, 2014
customer
segment
Dec. 31, 2013
customer
Dec. 31, 2012
customer
Segment Reporting Information [Line Items]      
Number of business segment 1us-gaap_NumberOfOperatingSegments    
Number of major customers (as defined) accounting for more than 10% of total revenue 3amgn_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue 3amgn_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue 3amgn_NumberOfCustomersAccountingForMoreThanTenPercentOfRevenue
Threshold as a percentage of total revenues for determining a major customer for additional disclosures 10.00%amgn_ThresholdForDisclosureOfProductSalesToMajorCustomers 10.00%amgn_ThresholdForDisclosureOfProductSalesToMajorCustomers 10.00%amgn_ThresholdForDisclosureOfProductSalesToMajorCustomers
Percentage of worldwide gross revenues derived from major customers (as defined) on a combined basis 77.00%amgn_PercentageOfCombinedWorldwideGrossRevenuesFromMajorCustomers    
Percentage of United States gross product sales derived from major customers (as defined) on a combined basis 94.00%amgn_PercentageOfCombinedGrossProductSalesFromMajorCustomers    
Major customers (as defined) accounting for more than 10% of gross trade receivables 3amgn_NumberOfCustomersAccountingForMoreThanTenPercentOfGrossTradeReceivables 3amgn_NumberOfCustomersAccountingForMoreThanTenPercentOfGrossTradeReceivables  
Combined trade receivables for all major customers (as defined) as a percentage of net trade receivables 69.00%amgn_PercentageOfCombinedNetTradeReceivablesFromMajorCustomers 63.00%amgn_PercentageOfCombinedNetTradeReceivablesFromMajorCustomers  
Percentage of net trade receivables due from customers located outside the United States, primarily in Europe 30.00%amgn_PercentageOfNetAmountDueFromCustomersLocatedOutsideDomesticLocation 35.00%amgn_PercentageOfNetAmountDueFromCustomersLocatedOutsideDomesticLocation  
AmerisourceBergen Corporation [Member]      
Segment Reporting Information [Line Items]      
Amount due from major customer (as defined) as a percentage of gross trade receivables exceeded 10% exceeded 10%  
McKesson Corporation [Member]      
Segment Reporting Information [Line Items]      
Amount due from major customer (as defined) as a percentage of gross trade receivables exceeded 10% exceeded 10%  
Cardinal Health, Inc. [Member]      
Segment Reporting Information [Line Items]      
Amount due from major customer (as defined) as a percentage of gross trade receivables exceeded 10% exceeded 10%