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Income Taxes (NOL and Tax Credit Carryforwards) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Operating Loss Carryforwards [Line Items]  
Undistributed earnings of foreign subsidiaries $ 7,541us-gaap_UndistributedEarningsOfForeignSubsidiaries
State  
Operating Loss Carryforwards [Line Items]  
NOL carryforwards 507.2us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
NOL carryforwards for which deferred tax assets have not been recorded 344.1celg_DeferredTaxAssetNotRecognizedOperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
Research  
Operating Loss Carryforwards [Line Items]  
Credit carryforwards 10.2us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember
Credit carryforwards for which deferred tax assets have not been recorded $ 5.7celg_DeferredTaxAssetNotRecognizedTaxCreditCarryforward
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember