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Commitments and Contingencies - Additional Information (Details) $ in Millions	1 Months Ended			2 Months Ended	3 Months Ended
	May 31, 2018 Patent	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	May 31, 2018 Patent	Sep. 30, 2016 USD ($)	Sep. 30, 2018 USD ($)	Feb. 28, 2018 Pending_Claim	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Damages awarded		$ 2,540
Motion invalidated past damages, amount		$ 2,540
Damages awarded but dismissed			$ 200
Litigation accrual						$ 0		$ 0
Number of pending claims with motions to dismiss | Pending_Claim							2
Merck '499 and '712 patents
Loss Contingencies [Line Items]
Damages awarded but dismissed, value					$ 200
Aurobindo Pharma USA Inc V.S. Gilead Sciences, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed | Patent				2
Strides Pharma, Inc V.S. Gilead Sciences, Inc - Emtricitabine Patent
Loss Contingencies [Line Items]
Number of patents allegedly infringed | Patent	2
Strides Pharma, Inc V.S. Gilead Sciences, Inc - Emtricitabine And Tenofovir Patent
Loss Contingencies [Line Items]
Number of patents allegedly infringed | Patent				4

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