XML 49 R37.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

FAIR VALUE MEASUREMENTS - Summary of Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Available-for-sale debt securities |  | $ 2,426
Fair Value, Measurements, Recurring | Galapagos |  |
Liabilities: |  |
Equity securities subject to contractual sale restrictions | $ 417 | 686
Fair Value, Measurements, Recurring | Arcellx, Inc |  |
Liabilities: |  |
Equity securities subject to contractual sale restrictions | 371 |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Total | 3,341 | 8,639
Liabilities: |  |
Total | 538 | 570
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | MYR GmbH |  |
Liabilities: |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 208 | 228
Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total | 3,281 | 6,633
Liabilities: |  |
Total | 327 | 283
Level 1 | Fair Value, Measurements, Recurring | MYR GmbH |  |
Liabilities: |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 0 | 0
Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total | 60 | 2,007
Liabilities: |  |
Total | 2 | 59
Level 2 | Fair Value, Measurements, Recurring | MYR GmbH |  |
Liabilities: |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 0 | 0
Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Total | 0 | 0
Liabilities: |  |
Total | 208 | 228
Level 3 | Fair Value, Measurements, Recurring | MYR GmbH |  |
Liabilities: |  |
Liability for MYR GmbH (“MYR”) contingent consideration | 208 | 228
U.S. treasury securities | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Available-for-sale debt securities | 0 | 426
U.S. treasury securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 426
U.S. treasury securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
U.S. treasury securities | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
U.S. government agencies securities | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Available-for-sale debt securities | 0 | 127
U.S. government agencies securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
U.S. government agencies securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 127
U.S. government agencies securities | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Non-U.S. government securities | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Available-for-sale debt securities | 0 | 10
Non-U.S. government securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Non-U.S. government securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 10
Non-U.S. government securities | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Certificates of deposit | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Available-for-sale debt securities | 0 | 45
Certificates of deposit | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Certificates of deposit | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 45
Certificates of deposit | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Corporate debt securities | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Available-for-sale debt securities | 0 | 1,451
Corporate debt securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Corporate debt securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 1,451
Corporate debt securities | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Residential mortgage and asset-backed securities | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Available-for-sale debt securities | 0 | 367
Residential mortgage and asset-backed securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Residential mortgage and asset-backed securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 367
Residential mortgage and asset-backed securities | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Available-for-sale debt securities | 0 | 0
Money market funds | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Marketable equity securities | 1,525 | 4,465
Money market funds | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 1,525 | 4,465
Money market funds | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 0 | 0
Money market funds | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 0 | 0
Publicly traded equity securities | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Marketable equity securities | 1,429 | 1,458
Publicly traded equity securities | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 1,429 | 1,458
Publicly traded equity securities | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 0 | 0
Publicly traded equity securities | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 0 | 0
Deferred compensation plan | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Marketable equity securities | 327 | 284
Liabilities: |  |
Deferred compensation plan | 327 | 283
Deferred compensation plan | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 327 | 284
Liabilities: |  |
Deferred compensation plan | 327 | 283
Deferred compensation plan | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 0 | 0
Liabilities: |  |
Deferred compensation plan | 0 | 0
Deferred compensation plan | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Marketable equity securities | 0 | 0
Liabilities: |  |
Deferred compensation plan | 0 | 0
Foreign currency derivative contracts | Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement |  |
Assets: |  |
Foreign currency derivative contracts | 60 | 7
Liabilities: |  |
Foreign currency derivative contracts | 2 | 59
Foreign currency derivative contracts | Level 1 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Foreign currency derivative contracts | 0 | 0
Liabilities: |  |
Foreign currency derivative contracts | 0 | 0
Foreign currency derivative contracts | Level 2 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Foreign currency derivative contracts | 60 | 7
Liabilities: |  |
Foreign currency derivative contracts | 2 | 59
Foreign currency derivative contracts | Level 3 | Fair Value, Measurements, Recurring |  |
Assets: |  |
Foreign currency derivative contracts | 0 | 0
Liabilities: |  |
Foreign currency derivative contracts | $ 0 | $ 0

X
- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 35 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479613/805-30-35-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479668/805-30-25-6 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-14 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Topic 944 -SubTopic 80 -Name Accounting Standards Codification -Section 55 -Paragraph 9 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480078/944-80-55-9 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(6)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
Name: | us-gaap_EquitySecuritiesFvNiCurrentAndNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) subject to contractual sale restriction. Excludes investment in equity security by investment company for which discount for contractual sale restriction is applied. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6B + Details
Name: | us-gaap_EquitySecurityFvNiContractualSaleRestriction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_ForeignCurrencyContractsLiabilityFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_LiabilitiesFairValueDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of other liabilities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_OtherLiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=gild_GalapagosMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=gild_ArcellxIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementBasisAxis=us-gaap_EstimateOfFairValueFairValueDisclosureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=gild_MYRGmbHMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=gild_ResidentialMortgageAndAssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_MoneyMarketFundsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=gild_DeferredCompensationPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=gild_ForeignCurrencyDerivativeContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |