2.2.0.25truefalse0613 - Disclosure - Subsequent events (Details)truefalseIn Millions, unless otherwise specifiedfalse1falsefalseUSDtruefalse{us-gaap_BusinessAcquisitionAxis} : Bergamo Member
4/1/2011 - 4/30/2011
USD ($)
$OneMonthEnded_30Apr2011_Bergamo_Memberhttp://www.sec.gov/CIK0000318154duration2011-04-01T00:00:002011-04-30T00:00:00falsefalseBergamo [Member]us-gaap_BusinessAcquisitionAxisxbrldihttp://xbrl.org/2006/xbrldiamgn_BergamoMemberus-gaap_BusinessAcquisitionAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2true0amgn_SubsequentEventsTextualsAbstractamgnfalsenadurationSubsequent events.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalseOtherxbrli:stringItemTypestringSubsequent events.falsefalse3false0dei_EntityNumberOfEmployeesdeifalsenainstantNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse400400falsefalsefalsefalsefalseOtherxbrli:decimalItemTypedecimalNumber of persons employed by the EntityNo authoritative reference available.falsefalse4false0us-gaap_SubsequentEventAmountus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1truefalsefalse215000000215falsetruefalsefalsefalseMonetaryxbrli:monetaryItemTypemonetaryReflects the known or estimated financial effect of the event, or transaction that occurred between the balance sheet date and the date the financial statements are issued. If an estimate cannot be made, that fact shall be disclosed.No authoritative reference available.falsefalse13Subsequent events (Details) (Bergamo [Member], USD $)MillionsUnKnownUnKnownUnKnowntruetrue