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INVESTMENTS - Related Party Transaction (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Related Party Transaction [Line Items]
Selling, general and administrative expenses	$ 1,921	$ 1,365	$ 3,372	$ 2,623
Gilead Foundation | Related Party
Related Party Transaction [Line Items]
Selling, general and administrative expenses			$ 63

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