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COMMITMENTS AND CONTINGENCIES (Details) $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Apr. 30, 2020 agreement plaintiff	Dec. 31, 2019 USD ($) opposingParty patent	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($) plaintiff lawsuit	Dec. 31, 2016 party
Loss Contingencies [Line Items]
Litigation accrual reversed | $			$ 175
Number of patents challenged, scenario one | patent		4
Number of patents challenged, scenario two | patent		2
Juno Therapeutics, Inc. and Sloan Kettering Cancer Center
Loss Contingencies [Line Items]
Damages awarded | $		$ 585
Running royalty rate from October 2017		27.60%
Enhancement rate on past damages	50.00%
Running royalty rate on future sales	27.60%
ViiV Healthcare Company | Pending Litigation
Loss Contingencies [Line Items]
Damages amount | $				$ 16,400
Pre-Exposure Prophylaxis
Loss Contingencies [Line Items]
Number of material transfer agreements | agreement	4
European Patent Claims 2024 Expiration
Loss Contingencies [Line Items]
Number of parties appealed		2
European Patent Claims 2026 Expiration
Loss Contingencies [Line Items]
Number of parties appealed		3
European Patent Claims 2032 Expiration
Loss Contingencies [Line Items]
Number of parties appealed		3
European Patent Claims 2027 Expiration
Loss Contingencies [Line Items]
Number of parties appealed		2
Number of parties filing opposition | party					3
Product Liability
Loss Contingencies [Line Items]
Number of class action lawsuits | lawsuit				1
Number of plaintiffs involved | plaintiff				24,000
Qui Tam
Loss Contingencies [Line Items]
Number of plaintiffs involved | plaintiff	2

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