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Legal Proceedings (Details)	6 Months Ended
Legal Proceedings (Details)	Jun. 30, 2012 item
Legal Proceedings
Number of defendants in suit	3

Name:	celg_LegalProceedingsDisclosureAbstract
Namespace Prefix:	celg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Represents the number of defendants in the law suit action.

No definition available.

Name:	celg_NumberOfDefendantsInSuit
Namespace Prefix:	celg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration