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GILEAD SCIENCES, INC.

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2.2.0.25truefalse41201 - Disclosure - Stockholders' Equity (Narrative) (Details)truefalseShare data in Millions, except Per Share datafalse1falsefalseUSDfalsefalse1/1/2011 - 3/31/2011 USD ($) USD ($) / shares $Duration_1_1_2011_To_3_31_2011http://www.sec.gov/CIK0000882095duration2011-01-01T00:00:002011-03-31T00:00:00Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170Unit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit13Standardhttp://www.xbrl.org/2003/instancepurexbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit15Standardhttp://www.gilead.com/2011-03-31yearsgild0USDUSD$2falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Stock Repurchase Program; $5B, May-10, 3-Year [Member] 5/1/2010 - 5/31/2010 USD ($) $Duration_5_1_2010_To_5_31_2010_us-gaap_StatementClassOfStockAxis_gild_StockRepurchaseProgramFiveBillionDollarMayTwoThousandTenThreeYearMemberhttp://www.sec.gov/CIK0000882095duration2010-05-01T00:00:002010-05-31T00:00:00falsefalseStock Repurchase Program; $5B, May-10, 3-Year [Member]us-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigild_StockRepurchaseProgramFiveBillionDollarMayTwoThousandTenThreeYearMemberus-gaap_StatementClassOfStockAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Stock Repurchase Program; $5B, May-10, 3-Year [Member] 1/1/2011 - 3/31/2011 USD ($) / shares USD ($) $Duration_1_1_2011_To_3_31_2011_us-gaap_StatementClassOfStockAxis_gild_StockRepurchaseProgramFiveBillionDollarMayTwoThousandTenThreeYearMemberhttp://www.sec.gov/CIK0000882095duration2011-01-01T00:00:002011-03-31T00:00:00falsefalseStock Repurchase Program; $5B, May-10, 3-Year [Member]us-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigild_StockRepurchaseProgramFiveBillionDollarMayTwoThousandTenThreeYearMemberus-gaap_StatementClassOfStockAxisexplicitMemberUnit14Dividehttp://www.xbrl.org/2003/iso4217USDiso4217http://www.xbrl.org/2003/instancesharesxbrli0Unit1Standardhttp://www.xbrl.org/2003/instancesharesxbrli0Unit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Stock Repurchase Program; $5B, May-10, 3-Year [Member] 5/1/2010 - 3/31/2011 USD ($) $Duration_5_1_2010_To_3_31_2011_us-gaap_StatementClassOfStockAxis_gild_StockRepurchaseProgramFiveBillionDollarMayTwoThousandTenThreeYearMemberhttp://www.sec.gov/CIK0000882095duration2010-05-01T00:00:002011-03-31T00:00:00falsefalseStock Repurchase Program; $5B, May-10, 3-Year [Member]us-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigild_StockRepurchaseProgramFiveBillionDollarMayTwoThousandTenThreeYearMemberus-gaap_StatementClassOfStockAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5falsefalseUSDtruefalse{us-gaap_StatementClassOfStockAxis} : Stock Repurchase Program; $5B, Jan-11, 3-year [Member] 1/1/2011 - 1/31/2011 USD ($) $Duration_1_1_2011_To_1_31_2011_us-gaap_StatementClassOfStockAxis_gild_StockRepurchaseProgramFiveBillionDollarJanuaryTwoThousandTenThreeYearMemberhttp://www.sec.gov/CIK0000882095duration2011-01-01T00:00:002011-01-31T00:00:00falsefalseStock Repurchase Program; $5B, Jan-11, 3-year [Member]us-gaap_StatementClassOfStockAxisxbrldihttp://xbrl.org/2006/xbrldigild_StockRepurchaseProgramFiveBillionDollarJanuaryTwoThousandTenThreeYearMemberus-gaap_StatementClassOfStockAxisexplicitMemberUnit12Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false0gild_StockRepurchaseProgramAuthorizedAmountgildfalsecreditdurationThe amount authorized by an entity's Board of Directors under a stock repurchase plan.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2truefalsefalse50000000005000000000falsetruefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5truefalsefalse50000000005000000000falsetruefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe amount authorized by an entity's Board of Directors under a stock repurchase plan.No authoritative reference available.falsefalse3false0us-gaap_StockRepurchasedAndRetiredDuringPeriodValueus-gaaptruedebitdurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3truefalsefalse548500000548500000falsefalsefalsetruefalse4truefalsefalse35700000003570000000falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryValue of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 falsefalse4false0gild_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmountgildfalsecreditdurationThe remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseverboselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3truefalsefalse14300000001430000000falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryThe remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.No authoritative reference available.falsefalse5false0us-gaap_StockRepurchasedAndRetiredDuringPeriodSharesus-gaaptruenadurationNo definition available.falsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3truefalsefalse1400000014.0falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalseSharesxbrli:sharesItemTypesharesNumber of shares that have been repurchased and retired during the period.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 falsefalse6false0gild_StockRepurchasedAndRetiredAveragePurchasePricegildfalsenadurationStock Repurchased And Retired Average Purchase Pricefalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1falsefalsefalse00falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3truefalsefalse39.1239.12falsetruefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalseEPSus-types:perShareItemTypedecimalStock Repurchased And Retired Average Purchase PriceNo authoritative reference available.falsetrue7false0gild_StockRepurchasePriceAllocatedToCommonStockAndApicgildfalsecreditdurationStock Repurchase Price Allocated to Common Stock and APICfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse4240000042400000falsefalsefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryStock Repurchase Price Allocated to Common Stock and APICNo authoritative reference available.falsefalse8false0gild_ExcessOfPurchasePriceOverParValueChargedAgainstRetainedEarningsgildfalsedebitdurationExcess Of Purchase Price Over Par Value Charged Against Retained Earningsfalsefalsefalsefalsefalsefalsefalsefalsefalsefalseterselabel1truefalsefalse514900000514900000falsetruefalsefalsefalse2falsefalsefalse00falsefalsefalsetruefalse3falsefalsefalse00falsefalsefalsetruefalse4falsefalsefalse00falsefalsefalsetruefalse5falsefalsefalse00falsefalsefalsetruefalseMonetaryxbrli:monetaryItemTypemonetaryExcess Of Purchase Price Over Par Value Charged Against Retained EarningsNo authoritative reference available.falsefalse57Stockholders' Equity (Narrative) (Details) (USD $)NoRoundingHundredThousandsNoRoundingUnKnownfalsetrue