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ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS (Details) € in Millions, shares in Millions, $ in Millions	1 Months Ended			3 Months Ended
	Jan. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Jan. 31, 2024 USD ($) shares	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Jan. 31, 2025 EUR (€)	Dec. 31, 2024 designee
Business Combination, Separately Recognized Transactions [Line Items]
Acquired in-process research and development expenses				$ 253	$ 4,131
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
LEO Pharma A/S Agreement | LEO Pharma A/S
Business Combination, Separately Recognized Transactions [Line Items]
Payments to acquire in process research and development	$ 250
Additional payments (up to)	1,500
SpinCo | Galapagos Subscription Agreement
Business Combination, Separately Recognized Transactions [Line Items]
Initial capital allocation (up to)	$ 2,540					€ 2,450
Ownership (as a percent)	25.00%					25.00%
Galapagos | Galapagos Subscription Agreement
Business Combination, Separately Recognized Transactions [Line Items]
Ownership (as a percent)	25.00%					25.00%
Arcus
Business Combination, Separately Recognized Transactions [Line Items]
Ownership (as a percent)			30.00%
Ownership interest, shares (in shares) | shares			31.4
Other (Income) Expense | Arcus
Business Combination, Separately Recognized Transactions [Line Items]
Additional equity investment, premium			$ 87
CymaBay
Business Combination, Separately Recognized Transactions [Line Items]
Total consideration transferred		$ 3,900
Acquired in-process research and development expenses					3,900
Share-based compensation expense					133
CymaBay | Research and Development Expense
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

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