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2405405 - Disclosure - Income taxes (Reconciliation of Total Gross Amounts of UTBs) (Details)
(http://www.amgen.com/role/IncomeTaxesReconciliationOfTotalGrossAmountsOfUtbsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000318154 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Income Tax Disclosure [Abstract]
 
 
 
Reconciliation of total gross amounts of unrecognized tax benefits (excluding interest, penalties, foreign tax credits and the federal tax benefit of state taxes related to unrecognized tax benefits)
 
 
 
Balance at beginning of year
2,114,000,000  
1,772,000,000  
1,415,000,000  
Additions based on tax positions related to the current year
425,000,000  
413,000,000  
379,000,000  
Additions based on tax positions related to prior years
18,000,000  
9,000,000  
37,000,000  
Reductions for tax positions of prior years
(7,000,000) 
(32,000,000) 
(45,000,000) 
Reductions for expiration of statute of limitations
0  
0  
(12,000,000) 
Settlements
(7,000,000) 
(48,000,000) 
(2,000,000) 
Balance at end of year
2,543,000,000  
 
2,114,000,000  
 
1,772,000,000