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ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS (Details) € in Millions, shares in Millions, $ in Millions	1 Months Ended			3 Months Ended			6 Months Ended
	Jan. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Jan. 31, 2024 USD ($) shares	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($) shares	Jun. 30, 2024 USD ($)	Feb. 28, 2025	Jan. 31, 2025 EUR (€)	Dec. 31, 2024 designee
Business Combination, Separately Recognized Transaction [Line Items]
Acquired in-process research and development expenses				$ 61	$ 38		$ 315	$ 4,169
Arcus
Business Combination, Separately Recognized Transaction [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 Transaction [Line Items]
Additional equity investment			233
LEO Pharma A/S Agreement | LEO Pharma A/S
Business Combination, Separately Recognized Transaction [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 Transaction [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 Transaction [Line Items]
Ownership (as a percent)	25.00%									25.00%
Arcus
Business Combination, Separately Recognized Transaction [Line Items]
Ownership (as a percent)									30.00%
Ownership interest, shares (in shares) | shares				31.4			31.4
Other (Income) Expense | Arcus
Business Combination, Separately Recognized Transaction [Line Items]
Additional equity investment, premium			$ 87
CymaBay
Business Combination, Separately Recognized Transaction [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 expenses
Business Combination, Separately Recognized Transaction [Line Items]
Share-based compensation expense						67
CymaBay | Selling, general and administrative expenses
Business Combination, Separately Recognized Transaction [Line Items]
Share-based compensation expense						$ 67

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