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Summary of Significant Accounting Policies (Details) (Southern Europe [Member], USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Southern European Receivables [Line Items]  
Accounts Receivable, Gross $ 765us-gaap_AccountsReceivableGross
Greater than 120 Days
  
Southern European Receivables [Line Items]  
Accounts Receivable, Gross 132us-gaap_AccountsReceivableGross
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= gild_Greaterthan120DaysMember
/ us-gaap_StatementGeographicalAxis
= gild_SouthernEuropeMember
Greater Than 12 Months
  
Southern European Receivables [Line Items]  
Accounts Receivable, Gross $ 42us-gaap_AccountsReceivableGross
/ us-gaap_FinancingReceivablesPeriodPastDueAxis
= gild_GreaterThan12MonthsMember
/ us-gaap_StatementGeographicalAxis
= gild_SouthernEuropeMember