Income Taxes - Schedule of Transition Tax (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
2023	$ 886
2024	1,182
2025	1,477
Total	$ 3,546	$ 4,000

Tax Cuts And Jobs Act, Transition Tax For Accumulated Foreign Earnings, Liability, Year One

No definition available.

Name:	gild_TaxCutsAndJobsActTransitionTaxForAccumulatedForeignEarningsLiabilityYearOne
Namespace Prefix:	gild_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Tax Cuts And Jobs Act, Transition Tax For Accumulated Foreign Earnings, Liability, Year Three

+ References

No definition available.

+ Details

Name:	gild_TaxCutsAndJobsActTransitionTaxForAccumulatedForeignEarningsLiabilityYearThree
Namespace Prefix:	gild_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Tax Cuts And Jobs Act, Transition Tax For Accumulated Foreign Earnings, Liability, Year Two

+ References

No definition available.

+ Details

Name:	gild_TaxCutsAndJobsActTransitionTaxForAccumulatedForeignEarningsLiabilityYearTwo
Namespace Prefix:	gild_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

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

- Definition

Amount of tax liability from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-URI https://asc.fasb.org/topic&trid=2144680

+ Details

Name:	us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant