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2.2.0.7 true AVAILABLE-FOR-SALE SECURITIES (Details) (USD $) 40301 - Disclosure - AVAILABLE-FOR-SALE SECURITIES (Details) true false false false 1 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 3 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 4 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 $ false 5 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ 2 Amortized cost 2 us-gaap_AvailableForSaleSecuritiesAmortizedCost us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 true true false false 2752540000 2752540000 false false false 2 false false false false 0 0 false false false 3 true true false false 2752540000 2752540000 false false false 4 false false false false 0 0 false false false 5 true true false false 2664579000 2664579000 false false false xbrli:monetaryItemType monetary This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 false 3 Gross unrealized gains 2 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 35294000 35294000 false false false 4 false false false false 0 0 false false false 5 false true false false 28450000 28450000 false false false xbrli:monetaryItemType monetary This item represents the gross unrealized gains for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized gains are the excess of the fair value of the Available-for-sale Securities over their carrying value as of the reporting date. Such gross unrealized gains are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge. All or a portion of the unrealized holding gain of an available-for-sale security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 false 4 Gross unrealized losses 2 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -8844000 -8844000 false false false 4 false false false false 0 0 false false false 5 false true false false -12444000 -12444000 false false false xbrli:monetaryItemType monetary This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 false 5 Estimated fair value 2 us-gaap_AvailableForSaleSecurities us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2778990000 2778990000 false false false 2 false false false false 0 0 false false false 3 false true false false 2778990000 2778990000 false false false 4 false false false false 0 0 false false false 5 false true false false 2680585000 2680585000 false false false xbrli:monetaryItemType monetary For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 false 6 Less than one year, amortized cost 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 558836000 558836000 false false false 2 false false false false 0 0 false false false 3 false true false false 558836000 558836000 false false false 4 false false false false 0 0 false false false 5 false true false false 429980000 429980000 false false false xbrli:monetaryItemType monetary This item represents debt securities, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph a false 7 Greater than one year but less than five years, amortized cost 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2007882000 2007882000 false false false 2 false false false false 0 0 false false false 3 false true false false 2007882000 2007882000 false false false 4 false false false false 0 0 false false false 5 false true false false 1878589000 1878589000 false false false xbrli:monetaryItemType monetary This item represents debt securities, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph b false 8 Greater than five years but less than ten years, amortized cost 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 20024000 20024000 false false false 2 false false false false 0 0 false false false 3 false true false false 20024000 20024000 false false false 4 false false false false 0 0 false false false 5 false true false false 56895000 56895000 false false false xbrli:monetaryItemType monetary This item represents debt securities, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph c false 9 Greater than ten years, amortized cost 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 164346000 164346000 false false false 2 false false false false 0 0 false false false 3 false true false false 164346000 164346000 false false false 4 false false false false 0 0 false false false 5 false true false false 297664000 297664000 false false false xbrli:monetaryItemType monetary This item represents debt securities, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are expected to mature after ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph d false 10 Total, amortized cost 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCost us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2751088000 2751088000 false false false 2 false false false false 0 0 false false false 3 false true false false 2751088000 2751088000 false false false 4 false false false false 0 0 false false false 5 false true false false 2663128000 2663128000 false false false xbrli:monetaryItemType monetary This item represents the total of all debt securities grouped by maturity dates, at cost, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any, which are classified neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 false 11 Less than one year, fair value 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 562382000 562382000 false false false 2 false false false false 0 0 false false false 3 false true false false 562382000 562382000 false false false 4 false false false false 0 0 false false false 5 false true false false 432714000 432714000 false false false xbrli:monetaryItemType monetary This item represents the fair value of debt securities which are expected to mature within one year of the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph a false 12 Greater than one year but less than five years, fair value 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2037037000 2037037000 false false false 2 false false false false 0 0 false false false 3 false true false false 2037037000 2037037000 false false false 4 false false false false 0 0 false false false 5 false true false false 1898183000 1898183000 false false false xbrli:monetaryItemType monetary This item represents the fair value of debt securities which are expected to mature after one year and through five years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph b false 13 Greater than five years but less than ten years, fair value 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 20811000 20811000 false false false 2 false false false false 0 0 false false false 3 false true false false 20811000 20811000 false false false 4 false false false false 0 0 false false false 5 false true false false 57585000 57585000 false false false xbrli:monetaryItemType monetary This item represents the fair value of debt securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph c false 14 Greater than ten years, fair value 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 156305000 156305000 false false false 2 false false false false 0 0 false false false 3 false true false false 156305000 156305000 false false false 4 false false false false 0 0 false false false 5 false true false false 288633000 288633000 false false false xbrli:monetaryItemType monetary This item represents the fair value of debt securities which are expected to mature after ten years from the balance sheet date which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 -Subparagraph d false 15 Total, fair value 2 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2776535000 2776535000 false false false 2 false false false false 0 0 false false false 3 false true false false 2776535000 2776535000 false false false 4 false false false false 0 0 false false false 5 false true false false 2677115000 2677115000 false false false xbrli:monetaryItemType monetary This item represents the total of all debt securities grouped by maturity dates, at fair value, which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 20 false 16 Gross realized gains on sales 2 us-gaap_AvailableForSaleSecuritiesGrossRealizedGains us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 7464000 7464000 false false false 2 false true false false 2436000 2436000 false false false 3 false true false false 9298000 9298000 false false false 4 false true false false 7374000 7374000 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph a false 17 Gross realized losses on sales 2 us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false -1900000 -1900000 false false false 2 false true false false -606000 -606000 false false false 3 false true false false -2174000 -2174000 false false false 4 false true false false -957000 -957000 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph a false 24 Number of securities in an unrealized loss position, percentage of total 2 gild_NumberOfSecuritiesInUnrealizedLossPositionPercentageOfTotalTextBlock gild false na instant Number Of Securities In An Unrealized Loss Position Percentage Of Total [Text Block] false false false false false false false false false false false terselabel false 1 false true false false 0.17 0.17 false false false 2 false false false false 0 0 false false false 3 false true false false 0.17 0.17 false false false 4 false false false false 0 0 false false false 5 false true false false 0.32 0.32 false false false us-types:percentItemType pure Number Of Securities In An Unrealized Loss Position Percentage Of Total [Text Block] No authoritative reference available. false 25 Net unrealized gains on available-for-sale securities included in accumulated other comprehensive income 2 gild_NetUnrealizedGainsOnAvailableForSaleSecuritiesIncludedInAccumulatedOtherComprehensiveIncome gild false debit duration Net unrealized gains on available-for-sale securities included in accumulated other comprehensive income false false false false false false false false false false false terselabel false 1 false true false false 6900000 6900000 false false false 2 false true false false 8000000 8000000 false false false 3 false true false false 8700000 8700000 false false false 4 false true false false 13400000 13400000 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Net unrealized gains on available-for-sale securities included in accumulated other comprehensive income No authoritative reference available. false 26 Amounts reclassified out of accumulated OCI into interest and other income, net 2 us-gaap_OtherComprehensiveIncomeReclassificationAdjustmentForSaleOfSecuritiesIncludedInNetIncomeNetOfTax us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false true false false 3100000 3100000 false false false 2 false true false false 1300000 1300000 false false false 3 false true false false 4000000 4000000 false false false 4 false true false false 4100000 4100000 false false false 5 false false false false 0 0 false false false xbrli:monetaryItemType monetary Reclassification adjustment for unrealized gains or losses realized upon the sale of securities, after tax. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph c(3) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 24 -Subparagraph b Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 130 -Paragraph 18, 19 false 27 Cash and cash equivalents [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.gilead.com/taxonomy/role/disclosureavailableforsalesecuritiesdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 6 USD true false false false Cash and cash equivalents [Member] us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CashAndCashEquivalentsMember us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 7 USD true false false false Cash and cash equivalents [Member] us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi us-gaap_CashAndCashEquivalentsMember us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 31 Estimated fair value 2 us-gaap_AvailableForSaleSecurities us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 44094000 44094000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 48697000 48697000 false false false xbrli:monetaryItemType monetary For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 false 53 Short term marketable securities [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.gilead.com/taxonomy/role/disclosureavailableforsalesecuritiesdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 8 USD true false false false Short term marketable securities [Member] us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi gild_ShortTermMarketableSecuritiesMember us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 9 USD true false false false Short term marketable securities [Member] us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi gild_ShortTermMarketableSecuritiesMember us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 57 Estimated fair value 2 us-gaap_AvailableForSaleSecurities us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 518286000 518286000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 384017000 384017000 false false false xbrli:monetaryItemType monetary For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 false 79 Long term marketable securities [Member] 0 na true na na No definition available. false true false false false false false false false false false http://www.gilead.com/taxonomy/role/disclosureavailableforsalesecuritiesdetails false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false false false false 0 0 false false false false 10 USD true false false false Long term marketable securities [Member] us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi gild_LongTermMarketableSecuritiesMember us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ false 11 USD true false false false Long term marketable securities [Member] us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis xbrldi http://xbrl.org/2006/xbrldi gild_LongTermMarketableSecuritiesMember us-gaap_ScheduleOfAvailableForSaleSecuritiesMajorTypesOfDebtAndEquitySecuritiesAxis explicitMember Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ na No definition available. No authoritative reference available. false 83 Estimated fair value 2 us-gaap_AvailableForSaleSecurities us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 2216610000 2216610000 false false false 2 false false false false 0 0 false false false 3 false false false false 0 0 false false false 4 false false false false 0 0 false false false 5 false true false false 2247871000 2247871000 false false false xbrli:monetaryItemType monetary For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. 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No authoritative reference available. false 314 Amortized cost 2 us-gaap_AvailableForSaleSecuritiesAmortizedCost us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 85573000 85573000 false false false 4 false false false false 0 0 false false false 5 false true false false 74057000 74057000 false false false xbrli:monetaryItemType monetary This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments made for accretion, amortization, other-than-temporary impairments, and hedging, if any. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7 -Footnote 2 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 false 315 Gross unrealized gains 2 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains us-gaap true credit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 1250000 1250000 false false false 4 false false false false 0 0 false false false 5 false true false false 1181000 1181000 false false false xbrli:monetaryItemType monetary This item represents the gross unrealized gains for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized gains are the excess of the fair value of the Available-for-sale Securities over their carrying value as of the reporting date. Such gross unrealized gains are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge. All or a portion of the unrealized holding gain of an available-for-sale security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 false 316 Gross unrealized losses 2 us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -6000 -6000 false false false 4 false false false false 0 0 false false false 5 false true false false -102000 -102000 false false false xbrli:monetaryItemType monetary This item represents the gross unrealized losses for securities which are categorized neither as held-to-maturity nor trading securities. Such gross unrealized losses are the excess of the carrying value of the Available-for-sale Securities over their fair value as of the reporting date. Such gross unrealized losses are included in other comprehensive income in the statement of shareholders' equity, unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 false 317 Estimated fair value 2 us-gaap_AvailableForSaleSecurities us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 86817000 86817000 false false false 4 false false false false 0 0 false false false 5 false true false false 75136000 75136000 false false false xbrli:monetaryItemType monetary For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading. Such securities are reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale Security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain or loss of an Available-for-sale Security that is designated as being hedged in a fair value hedge shall be recognized in earnings during the period of the hedge, as should other than temporary declines in fair value below costs basis. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 14 false 330 Less than 12 months, gross unrealized losses 2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -6000 -6000 false false false 4 false false false false 0 0 false false false 5 false true false false -102000 -102000 false false false xbrli:monetaryItemType monetary This item represents the excess of [amortized] cost over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) false 331 Less than 12 months, estimated fair value 2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false 3061000 3061000 false false false 4 false false false false 0 0 false false false 5 false true false false 29698000 29698000 false false false xbrli:monetaryItemType monetary This item represents the fair value of securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) false 334 Total, gross unrealized losses 2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses us-gaap true debit duration No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 false true false false -6000 -6000 false false false 4 false false false false 0 0 false false false 5 false true false false -102000 -102000 false false false xbrli:monetaryItemType monetary This item represents the excess of [amortized] cost over fair value of securities in a loss position and which are categorized neither as held-to-maturity nor trading securities. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a(2) Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a(1) false 335 Total, estimated fair value 2 us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue us-gaap true debit instant No definition available. false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 false false false false 0 0 false false false 3 true true false false 3061000 3061000 false false false 4 false false false false 0 0 false false false 5 true true false false 29698000 29698000 false false false xbrli:monetaryItemType monetary This item represents the fair value of securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. 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