2.2.0.7 false Summary of Significant Accounting Policies (Policies) 0402 - Disclosure - Summary of Significant Accounting Policies (Policies) true false false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 $ 2 Summary of Significant Accounting Policies (Policies) [Abstract] 0 celg_SummaryOfSignificantAccountingPoliciesPoliciesAbstract celg false na duration Summary of Significant Accounting Policies Abstract. false false false false false true false false false false false false 1 false false false false 0 0 false false false xbrli:stringItemType string Summary of Significant Accounting Policies Abstract. false 3 Adoption of ASU No. 2009-13 1 celg_RevenueRecognitionMultipleElementArrangementsTextBlock celg false na duration Revenue Recognition Multiple Element Arrangements. false false false false false false false false false false false verboselabel false 1 false false false false 0 0   <div align="justify" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif"> <div align="justify" style="font-size: 10pt; margin-top: 10pt"><b>New Accounting Pronouncements: </b>In October 2009, the Financial Accounting Standards Board, or FASB, issued Accounting Standard Update, or ASU, No. 2009-13, “Multiple-Deliverable Revenue Arrangements,” or ASU 2009-13, which amends existing revenue recognition accounting pronouncements that are currently within the scope of ASC 605. This guidance eliminates the requirement to establish the fair value of undelivered products and services and instead provides for separate revenue recognition based upon management’s estimate of the selling price for an undelivered item when there is no other means to determine the fair value of that undelivered item. ASU 2009-13 is effective prospectively for revenue arrangements entered into or materially modified in fiscal years beginning on or after June 15, 2010. The Company is currently evaluating the impact, if any, that the adoption of this amendment will have on its consolidated financial statements. </div> </div>    <div align="justify" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif"> <div align="justify" style="font-size: 10pt; margin-top: 10pt">In January 2010, the FASB issued ASU No. 2010-06, <i>“</i>Improving Disclosures About Fair Value Measurements,” or ASU 2010-06, which amends ASC 820 to add new requirements for disclosures about transfers into and out of Levels 1 and 2 and separate disclosures about purchases, sales, issuances, and settlements relating to Level 3 measurements. ASU 2010-06 also clarifies existing fair value disclosures about the level of disaggregation and about inputs and valuation techniques used to measure fair value. Further, ASU 2010-06 amends guidance on employers’ disclosures about postretirement benefit plan assets under ASC 715 to require that disclosures be provided by classes of assets instead of by major categories of assets. ASU 2010-06 was effective for the first reporting period (including interim periods) beginning after December 15, 2009, except for the requirement to provide the Level 3 activity of purchases, sales, issuances, and settlements on a gross basis, which will be effective for fiscal years beginning after December 15, 2010, and for interim periods within those fiscal years. Early adoption is permitted. The section of the amendment pertaining to transfers into and out of Levels 1 and 2 was effective for the Company beginning January 1, 2010. The adoption of this section of the amendment did not have any impact on the Company’s consolidated financial statements. The section of the amendment pertaining to Level 3 measurements will be effective for the Company beginning January 1, 2011. The Company is currently evaluating the impact, if any, that the adoption of this amendment will have on its consolidated financial statements. </div> </div>    <div align="justify" style="font-size: 10pt; font-family: 'Times New Roman',Times,serif"> <div align="justify" style="font-size: 10pt; margin-top: 10pt">In April 2010, the FASB issued ASU No. 2010-17, “Milestone Method of Revenue Recognition,” or ASU 2010-17, to (1) limit the scope of this ASU to research or development arrangements and (2) require that guidance in this ASU be met for an entity to apply the milestone method (record the milestone payment in its entirety in the period received). However, the FASB clarified that, even if the requirements in ASU 2010-17 are met, entities would not be precluded from making an accounting policy election to apply another appropriate accounting policy that results in the deferral of some portion of the arrangement consideration. The guidance in ASU 2010-17 will apply to milestones in both single-deliverable and multiple-deliverable arrangements involving research or development transactions. ASU 2010-17 will be effective for fiscal years (and interim periods within those fiscal years) beginning on or after June 15, 2010. Early application is permitted. Entities can apply this guidance prospectively to milestones achieved after adoption. However, retrospective application to all prior periods is also permitted. The Company is currently evaluating the impact, if any, that the adoption of ASU 2010-17 will have on its consolidated financial statements. </div> </div>  <!-- Begin Block Tagged false false false us-types:textBlockItemType textblock Describes an entity's accounting policy for revenue recognition. If the entity has different policies for different types of revenue transactions, the policy for each material type of transaction should be disclosed. If a sales transaction has multiple element arrangements (for example, delivery of multiple products, services or the rights to use assets) the disclosure may indicate the accounting policy for each unit of accounting as well as how units of accounting are determined and valued. The disclosure may encompass important judgment as to appropriateness of principles related to recognition of revenue. The disclosure also may indicate the entity's treatment of any unearned or deferred revenue that arises from the transaction. 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