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SEGMENT INFORMATION
 3 Months Ended
Mar. 31, 2025
Segment Reporting [Abstract]  
SEGMENT INFORMATION SEGMENT INFORMATION
We have one operating segment which primarily focuses on the discovery, development and commercialization of innovative medicines in areas of unmet medical need. Our Chief Executive Officer, as the chief operating decision-maker (“CODM”), manages and allocates resources to the operations of our company on an entity-wide basis, using Net income (loss) attributable to Gilead as the primary performance measure. Managing and allocating resources on this basis enables our CODM to assess the overall level of resources available and how to best deploy these resources across functions and research and development (“R&D”) projects based on unmet medical need, scientific data, probability of technical and regulatory successful development, market potential and other considerations, and, as necessary, reallocate resources among our internal R&D portfolio and external opportunities to best support the long-term growth of our business. Our CODM is regularly provided with entity-wide expense categories similar to those found on our Condensed Consolidated Statements of Operations, as well as the following:
Three Months Ended
March 31,
(in millions)20252024
Selling and marketing expenses$753 $743 
General and administrative expenses505 632 
Selling, general and administrative expenses$1,258 $1,375 
Asset information is not regularly provided to the CODM for assessing performance and allocating resources other than consolidated cash, cash equivalents and marketable debt securities, which can be found on our Condensed Consolidated Balance Sheets.