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Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018
Revenue Recognition [Abstract]
Revenue earned from performance obligation satisfied in previous period	$ 10
Contract assets	$ 117	$ 132

X

- Definition

Contract With Customer, Asset, Net

+ References

No definition available.

+ Details

Name:	gild_ContractWithCustomerAssetNet
Namespace Prefix:	gild_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Contract With Customer, Performance Obligation Satisfied In Previous Period, Revenue

+ References

No definition available.

+ Details

Name:	gild_ContractWithCustomerPerformanceObligationSatisfiedInPreviousPeriodRevenue
Namespace Prefix:	gild_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_RevenueRecognitionAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration