beatandraise : Equity Research with AI and ChatGPT on SEC Edgar

beatandraise.com

2.2.0.7 false Consolidated Statements of Cash Flows (Unaudited) (USD $) 0130 - Statement - Consolidated Statements of Cash Flows (Unaudited) true false In Thousands false false 1 USD false false USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false Shares Standard http://www.xbrl.org/2003/instance shares xbrli 0 USD Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Pure Standard http://www.xbrl.org/2003/instance pure xbrli 0 USDEPS Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ 3 Cash flows from operating activities: 1 us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income. false 4 Net income 2 us-gaap_ProfitLoss us-gaap true credit duration No definition available. false false false false false false false false false false false verboselabel false 1 true true false false 626821000 626821 false false false 2 true true false false 671066000 671066 false false false xbrli:monetaryItemType monetary The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph A1, A4, A5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 5 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph a Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(1) false 5 Adjustments to reconcile net income to net cash flows from operating activities: 2 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 6 Depreciation and amortization of property, plant and equipment and intangible assets 3 us-gaap_DepreciationAndAmortization us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 260089000 260089 false false false 2 false true false false 334761000 334761 false false false xbrli:monetaryItemType monetary The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 false 7 Acquired in-process research and development 3 us-gaap_ResearchAndDevelopmentInProcess us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 271376000 271376 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The amount of purchased research and development assets that are acquired in a business combination have no alternative future use and are therefore written off in the period of acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph g Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 4 -Paragraph 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 2 -Paragraph 13 false 8 Share-based compensation 3 us-gaap_ShareBasedCompensation us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 134594000 134594 false false false 2 false true false false 119902000 119902 false false false xbrli:monetaryItemType monetary The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock options, amortization of restricted stock, and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 9 Non-cash interest (income) expense and foreign exchange remeasurement loss (gain), net 3 us-gaap_OtherNoncashExpense us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 1124000 1124 false false false 2 false true false false -12861000 -12861 false false false xbrli:monetaryItemType monetary Other expenses included in net income that result in no cash inflows or outflows in the period which are not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 10 Deferred income taxes 3 us-gaap_DeferredIncomeTaxExpenseBenefit us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false -61244000 -61244 false false false 2 false true false false -72580000 -72580 false false false xbrli:monetaryItemType monetary The component of income tax expense for the period representing the net change in the entity's deferred tax assets and liabilities pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 6 -Section I -Subsection 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 45 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 289 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 false 11 Realized gain on sale of marketable securities and strategic investments 3 us-gaap_GainLossOnInvestments us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -16113000 -16113 false false false 2 false true false false -17185000 -17185 false false false xbrli:monetaryItemType monetary This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain or loss of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain or loss which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments of the subject investments. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 22 false 12 Write-down of inventory to net realizable value 3 us-gaap_InventoryWriteDown us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 9918000 9918 false false false 2 false true false false 13431000 13431 false false false xbrli:monetaryItemType monetary Charge to cost of goods sold that represents the reduction of the carrying amount of inventory, generally attributable to obsolescence or market conditions. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Chapter 4 -Section 7 -Paragraph 14 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Concepts (CON) -Number 6 -Paragraph 86 false 13 Loss on disposal of property, plant and equipment, net 3 us-gaap_GainsLossesOnSalesOfAssets us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 1748000 1748 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The net gain or loss resulting from the sale, transfer, termination, or other disposition of assets during the period, excluding transactions involving capital leases, assets-held- or available-for-lease, and other real estate owned which, to the extent appropriate, are included in gains (losses) on the disposition of assets in nonoperating income (expense). No authoritative reference available. false 14 Impairment of marketable securities, investments and other assets 3 biib_ImpairmentOfInvestmentsAndOtherAssets biib false debit duration This element represents the amount by which the carrying amount exceeds the fair value of the investment and other assets.... false false false false false false false false false false false verboselabel false 1 false true false false 19319000 19319 false false false 2 false true false false 9866000 9866 false false false xbrli:monetaryItemType monetary This element represents the amount by which the carrying amount exceeds the fair value of the investment and other assets. The amount is charged to income if the decline in fair value is deemed to be other than temporary. No authoritative reference available. false 15 Excess tax benefit from share-based compensation 3 us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -6284000 -6284 false false false 2 false true false false -3194000 -3194 false false false xbrli:monetaryItemType monetary Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element reduces net cash provided by operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A96 false 16 Changes in operating assets and liabilities, net: 3 us-gaap_IncreaseDecreaseInOperatingCapitalAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 17 Accounts receivable 4 us-gaap_IncreaseDecreaseInAccountsReceivable us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -72719000 -72719 false false false 2 false true false false -96215000 -96215 false false false xbrli:monetaryItemType monetary The net change during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 18 Due from unconsolidated joint business 4 biib_IncreaseDecreaseInDueFromUnconsolidatedJointBusiness biib false credit duration Increase Decrease In Due From Unconsolidated Joint Business. false false false false false false false false false false true negated false 1 false true false false -27829000 -27829 false false false 2 false true false false 13646000 13646 false false false xbrli:monetaryItemType monetary Increase Decrease In Due From Unconsolidated Joint Business. No authoritative reference available. false 19 Inventory 4 us-gaap_IncreaseDecreaseInInventories us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false 16311000 16311 false false false 2 false true false false -25195000 -25195 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 20 Other assets 4 us-gaap_IncreaseDecreaseInOtherOperatingAssets us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -22435000 -22435 false false false 2 false true false false 8555000 8555 false false false xbrli:monetaryItemType monetary The net change during the reporting period in other operating assets not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 21 Accrued expenses and other current liabilities 4 us-gaap_IncreaseDecreaseInAccruedLiabilities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 17377000 17377 false false false 2 false true false false -37733000 -37733 false false false xbrli:monetaryItemType monetary The net change during the reporting period in the aggregate amount of expenses incurred but not yet paid. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 false 22 Other liabilities and taxes payable 4 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 41564000 41564 false false false 2 false true false false -110706000 -110706 false false false xbrli:monetaryItemType monetary The net change during the reporting period in other operating obligations not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 true 23 Net cash flows provided by operating activities 3 us-gaap_NetCashProvidedByUsedInOperatingActivities us-gaap true na duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 1193617000 1193617 false false false 2 false true false false 795558000 795558 false false false xbrli:monetaryItemType monetary The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 24 Cash flows from investing activities: 1 us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 25 Purchases of marketable securities 2 us-gaap_PaymentsToAcquireMarketableSecurities us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -1371769000 -1371769 false false false 2 false true false false -3001156000 -3001156 false false false xbrli:monetaryItemType monetary The cash outflow from purchases of trading, available-for-sale securities and held-to-maturity securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph a Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph b false 26 Proceeds from sales and maturities of marketable securities 2 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2490363000 2490363 false false false 2 false true false false 2334093000 2334093 false false false xbrli:monetaryItemType monetary The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (trading, held-to-maturity, or available-for-sale) during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph a false 27 Acquisitions 2 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -39976000 -39976 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15, 17 false 28 Acquisition of a variable interest entity, net 2 biib_AcquisitionOfVariableInterestNet biib false credit duration Acquisition of variable interest net. false false false false false false false false false false true negated false 1 false true false false -84952000 -84952 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Acquisition of variable interest net. No authoritative reference available. false 29 Purchases of property, plant and equipment 2 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -124220000 -124220 false false false 2 false true false false -110129000 -110129 false false false xbrli:monetaryItemType monetary The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c false 30 Purchases of other investments 2 us-gaap_PaymentsToAcquireOtherInvestments us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -5499000 -5499 false false false 2 false true false false -36519000 -36519 false false false xbrli:monetaryItemType monetary The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 false 31 Proceeds from the sale of a strategic equity investment 2 us-gaap_ProceedsFromSaleOfEquityMethodInvestments us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false true false false 6067000 6067 false false false xbrli:monetaryItemType monetary The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 16 -Subparagraph b false 32 Collateral received under securities lending 2 biib_CollateralReceivedUnderSecuritiesLending biib false debit duration We loan certain securities from our portfolio to other institutions. As such securities transactions are classified as loaned... false false false false false false false false false false false totallabel false 1 false false false false 0 0 false false false 2 false true false false 29991000 29991 false false false xbrli:monetaryItemType monetary We loan certain securities from our portfolio to other institutions. As such securities transactions are classified as loaned securities on the accompanying consolidated cash flow. Collateral for the loaned securities, consisting of cash or other securities is maintained at a rate of approximately 102% of the market value of each loaned security. The cash collateral is recorded as collateral received for loaned securities as cash (in) flows. No authoritative reference available. true 33 Net cash flows provided by (used in) investing activities 2 us-gaap_NetCashProvidedByUsedInInvestingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false 863947000 863947 false false false 2 false true false false -777653000 -777653 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from investing activity. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 34 Cash flows from financing activities: 1 us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract us-gaap true na duration No definition available. false false false false false true false false false false false verboselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false xbrli:stringItemType string No definition available. false 35 Purchases of treasury stock 2 us-gaap_PaymentsForRepurchaseOfCommonStock us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -2077579000 -2077579 false false false 2 false true false false -57631000 -57631 false false false xbrli:monetaryItemType monetary The cash outflow to reacquire common stock during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 36 Proceeds from issuance of stock for share-based compensation arrangements 2 us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 80447000 80447 false false false 2 false true false false 33236000 33236 false false false xbrli:monetaryItemType monetary The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i false 37 Change in cash overdraft 2 us-gaap_ProceedsFromRepaymentsOfBankOverdrafts us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 2586000 2586 false false false 2 false true false false 7497000 7497 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from the excess drawing from an existing cash balance, which will be honored by the bank but reflected as a loan to the drawer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Technical Practice Aid (TPA) -Number 1300 -Paragraph 15 false 38 Net distributions to noncontrolling interest 2 us-gaap_PaymentsToMinorityShareholders us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -6401000 -6401 false false false 2 false true false false -2832000 -2832 false false false xbrli:monetaryItemType monetary The cash outflow to return capital to noncontrolled interest, which generally occurs when noncontrolling shareholders reduce their ownership stake (in a subsidiary of the entity). This element does not include dividends paid to noncontrolling shareholders. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph a false 39 Excess tax benefit from share-based compensation 2 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 6284000 6284 false false false 2 false true false false 3194000 3194 false false false xbrli:monetaryItemType monetary Reductions in the entity's income taxes that arise when compensation cost (from non-qualified share-based compensation) recognized on the entity's tax return exceeds compensation cost from share-based compensation recognized in financial statements. This element represents the cash inflow reported in the enterprise's financing activities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph i Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 00-15 -Paragraph 3 false 40 Repayment of borrowings 2 us-gaap_RepaymentsOfShortTermDebt us-gaap true credit duration No definition available. false false false false false false false false false false true negated false 1 false true false false -16182000 -16182 false false false 2 false true false false -10867000 -10867 false false false xbrli:monetaryItemType monetary The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 18 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 20 -Subparagraph b false 41 Obligation under securities lending 2 biib_ObligationUnderSecuritiesLending biib false credit duration This is the liability that is maintain on the Company ledger to offset the fact we loan certain securities from our portfolio... false false false false false false false false false false true negatedtotal false 1 false false false false 0 0 false false false 2 false true false false -29991000 -29991 false false false xbrli:monetaryItemType monetary This is the liability that is maintain on the Company ledger to offset the fact we loan certain securities from our portfolio to other institutions. As such securities transaction are classified as loaned securities on the accompanying consolidated cash flow. Collateral for the loaned securities, consisting of cash or other securities is maintained at a rate of approximately 102% of the market value of each loaned security. We have a current obligation to return the collateral which is reflected as collateral received on loaned securities on the accompanying consolidated cash (out) flow. No authoritative reference available. true 42 Net cash flows used in financing activities 2 us-gaap_NetCashProvidedByUsedInFinancingActivities us-gaap true debit duration No definition available. false false false false false false false false false false false totallabel false 1 false true false false -2010845000 -2010845 false false false 2 false true false false -57394000 -57394 false false false xbrli:monetaryItemType monetary The net cash inflow (outflow) from financing activity for the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 26 true 43 Net increase in cash and cash equivalents 1 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease us-gaap true na duration No definition available. false false false false false false false false false false false verboselabel false 1 false true false false 46719000 46719 false false false 2 false true false false -39489000 -39489 false false false xbrli:monetaryItemType monetary The net change between the beginning and ending balance of cash and cash equivalents. 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Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 25 false 45 Cash and cash equivalents, beginning of the period 1 us-gaap_CashAndCashEquivalentsAtCarryingValue us-gaap true debit instant No definition available. false false false false false false false false true false false periodstartlabel false 1 false true false false 581889000 581889 false false false 2 false true false false 622385000 622385 false false false xbrli:monetaryItemType monetary Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents. 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