XML 52 R36.htm IDEA: XBRL DOCUMENT
v3.20.1

Revenues Revenues Recognized from Performance Obligations Satisfied in Prior Periods (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Abstract] |  |
Revenues Recognized from Performance Obligations Satisfied in Prior Periods | $ 188 | $ 155
Contract with Customer, Performance Obligation Satisfied in Previous Period | $ 38 | $ 107

X
- Definition Revenues Recognized from Performance Obligations Satisfied in Prior Periods [Abstract] + References No definition available. + Details
Name: | gild_RevenuesRecognizedfromPerformanceObligationsSatisfiedinPriorPeriodsAbstract
Namespace Prefix: | gild_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Revenues recognized from performance obligations satisfied in previous periods + References No definition available. + Details
Name: | gild_Revenuesrecognizedfromperformanceobligationssatisfiedinpreviousperiods
Namespace Prefix: | gild_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12A -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL108322424-203045 + Details
Name: | us-gaap_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration