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Commitments and Contingencies (Details)	1 Months Ended		12 Months Ended		35 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2020 USD ($) plaintiff	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Apr. 30, 2020
Other Commitments [Line Items]
Number of plaintiffs | plaintiff			21,000
Active pharmaceutical ingredient
Other Commitments [Line Items]
2021			$ 1,200,000,000		$ 1,200,000,000
2022			486,000,000		486,000,000
2023			192,000,000		192,000,000
2024			70,000,000		70,000,000
2025			55,000,000		55,000,000
Indenix
Other Commitments [Line Items]
Damages awarded		$ 2,540,000,000
Past damages vacated				$ 2,540,000,000
Juno
Other Commitments [Line Items]
Damages awarded	$ 585,000,000
Running royalty rate from October 2017	27.60%
Enhancement rate on past damages						50.00%
Running royalty rate on future sales						27.60%
Estimate of possible loss representing past sales			811,000,000		811,000,000
Estimate of possible loss representing enhancement of past damages			389,000,000		389,000,000
Estimate of possible loss representing royalties and prejudgment interest			172,000,000		172,000,000
ViiV | Pending Litigation
Other Commitments [Line Items]
Value of damages sought					11,460,000,000
Minimum | Juno
Other Commitments [Line Items]
Estimate of possible loss			0		0
Maximum | Juno
Other Commitments [Line Items]
Estimate of possible loss			$ 1,400,000,000		$ 1,400,000,000

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