REVENUE - Reconciliation of Gross Product Sales to Net Product Sales (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Gross to Net Adjustments [Line Items]
Total Revenues	$ 11,489	$ 11,201
Total GTN adjustments	(5,758)	(8,988)
Prior period gross to net adjustment impacted by new accounting pronouncement	(21)	289
United States
Gross to Net Adjustments [Line Items]
Total Revenues	7,788	7,873
Total GTN adjustments	(4,800)	(8,200)
Gross product sales
Gross to Net Adjustments [Line Items]
Total Revenues	16,926	19,874
Net product sales
Gross to Net Adjustments [Line Items]
Total Revenues	11,168	10,886
Charge-backs and cash discounts
Gross to Net Adjustments [Line Items]
Total GTN adjustments	(2,467)	(2,958)
Medicaid and Medicare rebates
Gross to Net Adjustments [Line Items]
Total GTN adjustments	(1,875)	(3,840)
Other rebates, returns, discounts and adjustments
Gross to Net Adjustments [Line Items]
Total GTN adjustments	$ (1,416)	$ (2,190)

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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