XML 73 R62.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Debt and Credit Facilities - Summary of Debt Carrying Amount (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Debt Instrument [Line Items] |  |
Long-term debt | $ 27,316 | $ 33,542
Less current portion | 2,746 | 2,747
Total long-term debt, net | 24,570 | 30,795
Term Loan Facilities | Term Loan Due October 2018 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 999
Term Loan Facilities | Term Loan Due October 2020 |  |
Debt Instrument [Line Items] |  |
Long-term debt | 0 | 998
Term Loan Facilities | Term Loan Due October 2022 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 2,497
Unsecured Debt | Senior Unsecured Notes Due in September 2018 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.85% |
Long-term debt | $ 0 | 999
Unsecured Debt | 2017 Senior Unsecured Notes Due in September 2018 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 0 | 749
Basis Spread | 0.17% |
Variable Rate Basis | 3-month LIBOR |
Unsecured Debt | 2017 Senior Unsecured Notes Due in March 2019 |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 749 | 748
Basis Spread | 0.22% |
Variable Rate Basis | 3-month LIBOR |
Unsecured Debt | Senior Unsecured Notes Due in April 2019 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.05% |
Long-term debt | $ 500 | 499
Unsecured Debt | 2017 Senior Unsecured Notes Due in September 2019 with Fixed Rate |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.85% |
Long-term debt | $ 998 | 997
Unsecured Debt | 2017 Senior Unsecured Notes Due in September 2019 with Floating Rate |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 499 | 499
Basis Spread | 0.25% |
Variable Rate Basis | 3-month LIBOR |
Unsecured Debt | Senior Unsecured Notes Due In February 2020 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.35% |
Long-term debt | $ 499 | 499
Unsecured Debt | Senior Unsecured Notes Due in September 2020 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.55% |
Long-term debt | $ 1,995 | 1,994
Unsecured Debt | Senior Unsecured Notes Due in April 2021 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.50% |
Long-term debt | $ 996 | 995
Unsecured Debt | Senior Unsecured Notes Due In December 2021 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.40% |
Long-term debt | $ 1,247 | 1,246
Unsecured Debt | Senior Unsecured Notes Due in March 2022 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 1.95% |
Long-term debt | $ 498 | 497
Unsecured Debt | Senior Unsecured Notes Due in September 2022 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.25% |
Long-term debt | $ 997 | 996
Unsecured Debt | Senior Unsecured Notes Due in September 2023 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.50% |
Long-term debt | $ 745 | 745
Unsecured Debt | Senior Unsecured Notes Due in April 2024 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.70% |
Long-term debt | $ 1,743 | 1,742
Unsecured Debt | Senior Unsecured Notes Due in February 2025 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.50% |
Long-term debt | $ 1,745 | 1,744
Unsecured Debt | Senior Unsecured Notes Due in March 2026 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 3.65% |
Long-term debt | $ 2,731 | 2,729
Unsecured Debt | Senior Unsecured Notes Due in March 2027 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 2.95% |
Long-term debt | $ 1,245 | 1,244
Unsecured Debt | Senior Unsecured Notes Due in September 2035 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.60% |
Long-term debt | $ 990 | 990
Unsecured Debt | Senior Unsecured Notes Due in September 2036 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.00% |
Long-term debt | $ 740 | 740
Unsecured Debt | Senior Unsecured Notes Due in December 2041 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 5.65% |
Long-term debt | $ 995 | 995
Unsecured Debt | Senior Unsecured Notes Due in April 2044 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.80% |
Long-term debt | $ 1,734 | 1,733
Unsecured Debt | Senior Unsecured Notes Due in February 2045 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.50% |
Long-term debt | $ 1,730 | 1,730
Unsecured Debt | Senior Unsecured Notes Due in March 2046 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.75% |
Long-term debt | $ 2,216 | 2,215
Unsecured Debt | Senior Unsecured Notes Due in March 2047 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 4.15% |
Long-term debt | $ 1,724 | $ 1,723

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=gild_TermLoanFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_TermLoanDueOctober2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_TermLoanDueOctober2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_TermLoanDueOctober2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinSeptember2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_A2017SeniorUnsecuredNotesDueinSeptember2018Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_A2017SeniorUnsecuredNotesDueinMarch2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinApril2019Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_A2017SeniorUnsecuredNotesDueinSeptember2019withFixedRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_A2017SeniorUnsecuredNotesDueinSeptember2019withFloatingRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueInFebruary2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinSeptember2020Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueApril2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueDecember2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinMarch2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinSeptember2022Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinSeptember2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinApril2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinFebruary2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinMarch2026Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinMarch2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinSeptember2035Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinSeptember2036Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueDecember2041Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinApril2044Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinFebruary2045Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinMarch2046Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=gild_SeniorUnsecuredNotesDueinMarch2047Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |