2.2.0.7 false CREDIT FACILITY (Details) (USD $) 40901 - Disclosure - CREDIT FACILITY (Details) true false false false 1 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 Unit13 Standard http://www.xbrl.org/2003/instance pure xbrli 0 Unit14 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 Unit1 Standard http://www.xbrl.org/2003/instance shares xbrli 0 $ false 2 USD false false Unit12 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 $ 5 3 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 true true false false 1250000000 1250000000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 6 3 gild_BasisPointUsedInAdditionOfLiborInterestRateUnderCreditAgreementMinimum gild false na instant Basis Point Used In Addition Of LIBOR Interest Rate Under The Credit Agreement Minimum false false false false false false false false false false false terselabel false 1 false true false false 20 20 false false false 2 false false false false 0 0 false false false xbrli:integerItemType integer Basis Point Used In Addition Of LIBOR Interest Rate Under The Credit Agreement Minimum No authoritative reference available. false 7 3 gild_BasisPointUsedInAdditionOfLiborInterestRateUnderCreditAgreementMaximum gild false na instant Basis Point Used In Addition Of LIBOR Interest Rate Under The Credit Agreement Maximum false false false false false false false false false false false terselabel false 1 false true false false 32 32 false false false 2 false false false false 0 0 false false false xbrli:integerItemType integer Basis Point Used In Addition Of LIBOR Interest Rate Under The Credit Agreement Maximum No authoritative reference available. false 8 3 us-gaap_LineOfCreditFacilityAmountOutstanding us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 4500000 4500000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount borrowed under the credit facility as of the balance-sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 9 3 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity us-gaap true credit instant No definition available. false false false false false false false false false false false terselabel false 1 false true false false 745500000 745500000 false false false 2 false false false false 0 0 false false false xbrli:monetaryItemType monetary Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 false 10 3 gild_BorrowingUnderCreditAgreement gild false credit instant Borrowing Under The Credit Agreement false false false false false false false false false false false terselabel false 1 false false false false 0 0 false false false 2 true true false false 500000000 500000000 false false false xbrli:monetaryItemType monetary Borrowing Under The Credit Agreement No authoritative reference available. false 2 6 false NoRounding UnKnown UnKnown false true