INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions		9 Months Ended
	Mar. 18, 2024	Sep. 30, 2025	Sep. 30, 2024
Effective Income Tax Rate Reconciliation [Line Items]
Additional reserves		$ 160
Income tax payments		2,200	$ 3,100
Transition taxes paid		991	799
Minimum
Effective Income Tax Rate Reconciliation [Line Items]
Reasonably possible decrease in unrecognized tax benefits		260
Maximum
Effective Income Tax Rate Reconciliation [Line Items]
Reasonably possible decrease in unrecognized tax benefits		$ 300
Karuna
Effective Income Tax Rate Reconciliation [Line Items]
Payments to acquire assets	$ 14,027
Karuna | Acquired IPRD
Effective Income Tax Rate Reconciliation [Line Items]
Payments to acquire assets			$ 12,100