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Document and Entity Information - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018	Jul. 30, 2018
Document And Entity Information [Abstract]
Entity Registrant Name		Gilead Sciences Inc
Entity Central Index Key		0000882095
Current Fiscal Year End Date		--12-31
Entity Filer Category		Large Accelerated Filer
Document Type		10-Q
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus		2018
Document Fiscal Period Focus		Q2
Amendment Flag		false
Entity Common Stock, Shares Outstanding			1,296,340,593

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation 12B
-Number 240
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