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ACQUISITIONS, COLLABORATIONS AND OTHER ARRANGEMENTS (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended				3 Months Ended	6 Months Ended
	Jun. 30, 2026	May 31, 2026	Apr. 30, 2026	Jan. 31, 2025	Jun. 30, 2026	Jun. 30, 2026	Jun. 30, 2025
Asset Acquisition [Line Items]
Acquired in-process research and development expenses						$ 12,150	$ 315
Lakefront
Asset Acquisition [Line Items]
Percentage share of payment of upfront cash consideration	50.00%
Reduction to acquired in-process research and development expenses					$ 860	$ 860
Lakefront | Minimum
Asset Acquisition [Line Items]
Sales based tired royalty, low-end, percentage	20.00%				20.00%	20.00%
Lakefront | Maximum
Asset Acquisition [Line Items]
Sales based tired royalty, high-end, percentage	23.00%				23.00%	23.00%
LEO Pharma A/S | LEO Pharma A/S Agreement
Asset Acquisition [Line Items]
Payments to acquire in process research and development				$ 250
Additional payments (up to)				$ 1,500
Ouro Medicines LLC
Asset Acquisition [Line Items]
Total consideration transferred	$ 1,900
Cash consideration	1,600
Potential future milestone payments, maximum	500				$ 500	$ 500
Acquired in-process research and development expenses					1,900	1,900
Stock-based compensation expense					135	135
Ouro Medicines LLC | Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Asset Acquisition [Line Items]
Stock-based compensation expense					45	45
Ouro Medicines LLC | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Asset Acquisition [Line Items]
Stock-based compensation expense					91	91
Ouro Medicines LLC | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesCurrent
Asset Acquisition [Line Items]
Contingent liability	143				143	143
Ouro Medicines LLC | Location, Statement of Financial Position, Balance [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Asset Acquisition [Line Items]
Contingent liability	$ 133				133	133
Tubulis GmbH
Asset Acquisition [Line Items]
Total consideration transferred		$ 3,200
Potential future milestone payments, maximum		$ 1,900
Acquired in-process research and development expenses					3,100	3,100
Stock-based compensation expense					51	51
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Asset Acquisition [Line Items]
Stock-based compensation expense					28	28
Tubulis GmbH | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Asset Acquisition [Line Items]
Stock-based compensation expense					23	23
Arcellx, Inc
Asset Acquisition [Line Items]
Total consideration transferred			$ 6,400
Acquired in-process research and development expenses					7,000	7,000
Stock-based compensation expense					375	375
Assets acquired			324
Liabilities assumed			88
Settled investments			$ 773
Contingent value right (in dollars per share)			$ 5
Contingent value right, amount			$ 300
Contingent value right, sales threshold			$ 6,000
Arcellx, Inc | Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Asset Acquisition [Line Items]
Stock-based compensation expense					156	156
Arcellx, Inc | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense
Asset Acquisition [Line Items]
Stock-based compensation expense					$ 218	$ 218

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