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INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Tax Contingency [Line Items]
Effective income tax rate reconciliation (as a percent)		16.20%	(31.10%)		18.00%	11.80%
In-process research and development impairments		$ 0	$ 1,750		$ 190	$ 4,180
Acquired in-process research and development expenses		170	505		485	4,674
Income tax benefit		$ (589)	297		$ (1,391)	174
Forecast | Subsequent Event
Income Tax Contingency [Line Items]
Income tax benefit	$ 450
Decrease in unrecognized tax benefits	$ 530
CymaBay
Income Tax Contingency [Line Items]
Acquired in-process research and development expenses				$ 3,900
In Process Research And Development NSCLC
Income Tax Contingency [Line Items]
In-process research and development impairments			$ 1,800	$ 2,400		$ 4,200

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