ACQUISITIONS, DIVESTITURES, LICENSING AND OTHER ARRANGEMENTS - Schedule of Assets Acquired and Liabilities Assumed in Karuna Acquisition (Details) - Karuna - USD ($) $ in Millions		3 Months Ended
Mar. 18, 2024	Mar. 31, 2024
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions	$ 14,027
Transaction costs	55
Total consideration allocated	13,793
Common Stock
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions	12,606
Equity
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions	1,421
Unvested Equity Awards
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions	289
Less: Charge for unvested stock awards	$ (289)
Unvested Equity Awards \| Selling, general and administrative
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions		$ 130
Unvested Equity Awards \| Research and development
Asset Acquisition, Contingent Consideration [Line Items]
Payments for asset acquisitions		$ 159

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