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ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS (Details) € in Millions, $ in Millions					1 Months Ended	3 Months Ended
	Dec. 21, 2021 USD ($)	Mar. 04, 2021 USD ($)	Mar. 04, 2021 EUR (€)	May 27, 2020	Jan. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Nov. 18, 2021 program	Mar. 04, 2021 EUR (€)
Arcus | Arcus Collaboration Agreement and Stock Purchase Agreements
Business Combination, Separately Recognized Transactions [Line Items]
Opt-in term				10 years
Number of clinical stage programs with exercised options | program								3
Payments to opt-in the collaborative agreement	$ 725				$ 725
Arcus | Arcus Collaboration Agreement
Business Combination, Separately Recognized Transactions [Line Items]
Additional option fee on fourth, sixth and eighth anniversaries							$ 100
MYR GmbH
Business Combination, Separately Recognized Transactions [Line Items]
Acquisition consideration transferred		$ 1,600	€ 1,300
Cash paid for acquisition		1,200	€ 1,000
Liability for MYR GmbH (“MYR”) contingent consideration						$ 322
Fair value of contingent liability		$ 341
Measurement period adjustments						$ (18)
MYR GmbH | Maximum
Business Combination, Separately Recognized Transactions [Line Items]
Liability for MYR GmbH (“MYR”) contingent consideration | €									€ 300

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