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Restructuring (Summary of Charges by Type) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 31, 2015
Mar. 31, 2015
Restructuring Cost and Reserve [Line Items]    
Separation costs $ 48amgn_SeparationCosts  
Asset impairments 0us-gaap_AssetImpairmentCharges  
Accelerated depreciation 28us-gaap_RestructuringReserveAcceleratedDepreciation  
Other 16us-gaap_OtherRestructuringCosts  
Total 92us-gaap_RestructuringCostsAndAssetImpairmentCharges 650us-gaap_RestructuringCostsAndAssetImpairmentCharges
Cost of Sales [Member]    
Restructuring Cost and Reserve [Line Items]    
Separation costs 0amgn_SeparationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
 
Asset impairments 0us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
 
Accelerated depreciation 13us-gaap_RestructuringReserveAcceleratedDepreciation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
 
Other 1us-gaap_OtherRestructuringCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
 
Total 14us-gaap_RestructuringCostsAndAssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
 
Research and Development [Member]    
Restructuring Cost and Reserve [Line Items]    
Separation costs 0amgn_SeparationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
 
Asset impairments 0us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
 
Accelerated depreciation 14us-gaap_RestructuringReserveAcceleratedDepreciation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
 
Other 3us-gaap_OtherRestructuringCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
 
Total 17us-gaap_RestructuringCostsAndAssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
 
Selling, General and Administrative [Member]    
Restructuring Cost and Reserve [Line Items]    
Separation costs 0amgn_SeparationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
 
Asset impairments 0us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
 
Accelerated depreciation 1us-gaap_RestructuringReserveAcceleratedDepreciation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
 
Other 3us-gaap_OtherRestructuringCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
 
Total 4us-gaap_RestructuringCostsAndAssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_SellingGeneralAndAdministrativeExpensesMember
 
Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Separation costs 48amgn_SeparationCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember
 
Asset impairments 0us-gaap_AssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember
 
Accelerated depreciation 0us-gaap_RestructuringReserveAcceleratedDepreciation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember
 
Other 9us-gaap_OtherRestructuringCosts
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember
 
Total $ 57us-gaap_RestructuringCostsAndAssetImpairmentCharges
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherExpenseMember