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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	May 31, 2017 Patent	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	May 31, 2018 Patent	Jun. 30, 2016 USD ($)	Jun. 30, 2018 USD ($)	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
Amneal Pharmaceuticals, LLC V.S. Gilead Sciences, Inc
Loss Contingencies [Line Items]
Number of patents allegedly infringed | Patent		2
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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