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ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS (Details) shares in Millions, $ in Millions		1 Months Ended						3 Months Ended							9 Months Ended		12 Months Ended
	Feb. 22, 2023 USD ($)	Aug. 31, 2024 USD ($)	Jul. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jan. 31, 2024 USD ($) designee shares	Oct. 31, 2023 USD ($)	May 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jan. 30, 2023
Business Combination, Separately Recognized Transactions [Line Items]
Acquired in-process research and development expenses								$ 505				$ 91			$ 4,674	$ 808
Arcus
Business Combination, Separately Recognized Transactions [Line Items]
Ownership interest, shares (in shares) | shares					30.1
Ownership (as a percent)					33.00%
Arcellx, Inc | Global Strategic Collaboration Agreement
Business Combination, Separately Recognized Transactions [Line Items]
Acquired in-process research and development expenses								68			$ 101			$ 212
Maximum potential future milestone payments											$ 1,500						$ 1,500
Payments to acquire equity securities																	299
Revenue, performance obligation, percentage of U.S. profits																		50.00%
Arcellx, Inc | Global Strategic Collaboration Agreement | Arcellx, Inc
Business Combination, Separately Recognized Transactions [Line Items]
Revenue, performance obligation, percentage of U.S. profits																		50.00%
Arcus
Business Combination, Separately Recognized Transactions [Line Items]
Additional interest acquired, shares (in shares) | shares					15.2
Additional equity investment					$ 320
Option fee					$ 100
Number of designees | designee					3
Arcus | Prepaid and other current assets
Business Combination, Separately Recognized Transactions [Line Items]
Additional equity investment					$ 233
Other (Income) Expense | Arcus
Business Combination, Separately Recognized Transactions [Line Items]
Additional equity investment					$ 87
CymaBay
Business Combination, Separately Recognized Transactions [Line Items]
Total consideration transferred				$ 3,900
Acquired in-process research and development expenses										$ 3,900					$ 3,900
Share-based compensation expense										133
Asset acquisition, assets acquired				263						263
Asset acquisition, liabilities assumed				$ 228						228
Change of control payment									$ 101
Settlement of remaining liability		$ 108
CymaBay | Janssen Pharmaceutica NV
Business Combination, Separately Recognized Transactions [Line Items]
Payment to extinguish a future royalty obligation			$ 320
CymaBay | Research and development expenses
Business Combination, Separately Recognized Transactions [Line Items]
Share-based compensation expense										67
CymaBay | Selling, general and administrative expenses
Business Combination, Separately Recognized Transactions [Line Items]
Share-based compensation expense										$ 67
XinThera, Inc
Business Combination, Separately Recognized Transactions [Line Items]
Acquired in-process research and development expenses						$ 50							$ 170
Cash consideration							$ 200
Maximum potential future milestone payments							$ 760
Tmunity Therapeutics
Business Combination, Separately Recognized Transactions [Line Items]
Acquired in-process research and development expenses														244
Cash consideration	$ 300
Tmunity Therapeutics | Tmunity And University Of Pennsylvania
Business Combination, Separately Recognized Transactions [Line Items]
Acquired in-process research and development expenses								$ 47									$ 25
Maximum potential future milestone payments														$ 1,000

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