Name:	celg_DeferredCompensationArrangementDeferralByParticipantsAsPercentageOfBaseSalary
Namespace Prefix:	celg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the percentage of cash bonuses which an eligible participant can elect to defer under the deferred compensation arrangements.

No definition available.

Name:	celg_DeferredCompensationArrangementDeferralByParticipantsAsPercentageOfCashBonuses
Namespace Prefix:	celg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Represents the employer's matching contribution to the deferred compensation plan expressed as a percentage of participants' base salary.

No definition available.

Name:	celg_DeferredCompensationArrangementEmployerMatchAsPercentageOfBaseSalaryOfParticipants
Namespace Prefix:	celg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

The compensation expense recognized during the period pertaining to the deferred compensation arrangement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363

Name:	us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_DeferredCompensationArrangementWithIndividualPostretirementBenefitsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

No definition available.